Done...
i wrote(modified another...) a little script which does all of this for me. The script is started by the eventmanager in the CP on domaincreation. And it works!!! The only problem: vhosts.conf (if exists) is overwritten. But on new domain, this should be no problem. This script creates a pwd-protected dir "logs" on the vhost and creates an index.hrml with redirect to the awstatspl with parameters so the user can easy call www.domain.com/logs to view his logs

The conf-file for astats is created too.
Explanation of parameters: $1 = <new_domain_name>
I saved this script as "new_domain.sh" in "/usr/local/psa/bin" with rights: 774 root root
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#!/bin/bash
cd /home/httpd/vhosts/$1/httpdocs
ln -s /usr/local/awstats/wwwroot/classes/ awstatsclasses
ln -s /usr/local/awstats/wwwroot/css/ awstatscss
ln -s /usr/local/awstats/wwwroot/icon/ awstatsicons
ln -s /usr/local/awstats/wwwroot/cgi-bin awstats
mkdir logs
cp /home/httpd/vhosts/$1/conf/vhost.conf /home/httpd/vhosts/$1/conf/vhost.conf.bak
cat > /home/httpd/vhosts/$1/conf/vhost.conf <<EOF
# Directives to allow use of AWStats as a CGI
ScriptAlias /awstats/ "/home/httpd/vhosts/$1/httpdocs/awstats/"
#
# This is to permit URL access to scripts/files in AWStats directory.
#
<Directory "/home/httpd/vhosts/$1/httpdocs/awstats/">
Options none
AllowOverride None
Order allow,deny
Allow from all
</Directory>
<Directory "/home/httpd/vhosts/$1/httpdocs/logs">
AuthType Basic
AuthName "AWSTATS"
AuthUserFile /home/httpd/vhosts/$1/pd/d..plesk-stat
require valid-user
</Directory>
EOF
cat > /etc/awstats/awstats.www.$1.conf <<EOF
LogFile="/home/httpd/vhosts/$1/statistics/logs/access_log"
LogType=W
LogFormat=1
LogSeparator=" "
SiteDomain="www.$1"
HostAliases="$1 www.$1 127.0.0.1 localhost"
DNSLookup=2
DirData="/var/lib/awstats"
DirCgi="/cgi-bin"
DirIcons="/awstatsicons"
AllowToUpdateStatsFromBrowser=0
AllowFullYearView=2
EnableLockForUpdate=0
DNSStaticCacheFile="dnscache.txt"
DNSLastUpdateCacheFile="dnscachelastupdate.txt"
SkipDNSLookupFor=""
AllowAccessFromWebToAuthenticatedUsersOnly=0
AllowAccessFromWebToFollowingAuthenticatedUsers=""
AllowAccessFromWebToFollowingIPAddresses=""
CreateDirDataIfNotExists=0
BuildHistoryFormat=text
BuildReportFormat=html
SaveDatabaseFilesWithPermissionsForEveryone=0
PurgeLogFile=0
ArchiveLogRecords=0
KeepBackupOfHistoricFiles=0
DefaultFile="index.html"
SkipHosts=""
SkipUserAgents=""
SkipFiles=""
OnlyHosts=""
OnlyUserAgents=""
OnlyFiles=""
NotPageList="css js class gif jpg jpeg png bmp ico swf"
ValidHTTPCodes="200 304"
ValidSMTPCodes="1 250"
AuthenticatedUsersNotCaseSensitive=0
URLNotCaseSensitive=0
URLWithAnchor=0
URLQuerySeparators="?;"
URLWithQuery=0
URLWithQueryWithOnlyFollowingParameters=""
URLWithQueryWithoutFollowingParameters=""
URLReferrerWithQuery=0
WarningMessages=1
ErrorMessages=""
DebugMessages=0
NbOfLinesForCorruptedLog=50
WrapperScript=""
DecodeUA=0
MiscTrackerUrl="/js/awstats_misc_tracker.js"
LevelForBrowsersDetection=2
LevelForOSDetection=2
LevelForRefererAnalyze=2
LevelForRobotsDetection=2
LevelForSearchEnginesDetection=2
LevelForKeywordsDetection=2
LevelForFileTypesDetection=2
LevelForWormsDetection=0
UseFramesWhenCGI=1
DetailedReportsOnNewWindows=1
Expires=0
MaxRowsInHTMLOutput=1000
Lang="de"
DirLang="./lang"
ShowMenu=1
ShowSummary=UVPHB
ShowMonthStats=UVPHB
ShowDaysOfMonthStats=VPHB
ShowDaysOfWeekStats=PHB
ShowHoursStats=PHB
ShowDomainsStats=PHB
ShowHostsStats=PHBL
ShowAuthenticatedUsers=0
ShowRobotsStats=HBL
ShowWormsStats=0
ShowEMailSenders=0
ShowEMailReceivers=0
ShowSessionsStats=1
ShowPagesStats=PBEX
ShowFileTypesStats=HB
ShowFileSizesStats=0
ShowOSStats=1
ShowBrowsersStats=1
ShowScreenSizeStats=0
ShowOriginStats=PH
ShowKeyphrasesStats=1
ShowKeywordsStats=1
ShowMiscStats=a
ShowHTTPErrorsStats=1
ShowSMTPErrorsStats=0
ShowClusterStats=0
AddDataArrayMonthStats=1
AddDataArrayShowDaysOfMonthStats=1
AddDataArrayShowDaysOfWeekStats=1
AddDataArrayShowHoursStats=1
IncludeInternalLinksInOriginSection=0
MaxNbOfDomain = 10
MinHitDomain = 1
MaxNbOfHostsShown = 10
MinHitHost = 1
MaxNbOfLoginShown = 10
MinHitLogin = 1
MaxNbOfRobotShown = 10
MinHitRobot = 1
MaxNbOfPageShown = 10
MinHitFile = 1
MaxNbOfOsShown = 10
MinHitOs = 1
MaxNbOfBrowsersShown = 10
MinHitBrowser = 1
MaxNbOfScreenSizesShown = 5
MinHitScreenSize = 1
MaxNbOfWindowSizesShown = 5
MinHitWindowSize = 1
MaxNbOfRefererShown = 10
MinHitRefer = 1
MaxNbOfKeyphrasesShown = 10
MinHitKeyphrase = 1
MaxNbOfKeywordsShown = 10
MinHitKeyword = 1
MaxNbOfEMailsShown = 20
MinHitEMail = 1
FirstDayOfWeek=1
ShowFlagLinks=""
ShowLinksOnUrl=1
UseHTTPSLinkForUrl=""
MaxLengthOfShownURL=64
HTMLHeadSection=""
HTMLEndSection=""
Logo="awstats_logo6.png"
LogoLink="http://awstats.sourceforge.net"
BarWidth = 260
BarHeight = 90
StyleSheet=""
color_Background="FFFFFF" # Background color for main page (Default = "FFFFFF")
color_TableBGTitle="CCCCDD" # Background color for table title (Default = "CCCCDD")
color_TableTitle="000000" # Table title font color (Default = "000000")
color_TableBG="CCCCDD" # Background color for table (Default = "CCCCDD")
color_TableRowTitle="FFFFFF" # Table row title font color (Default = "FFFFFF")
color_TableBGRowTitle="ECECEC" # Background color for row title (Default = "ECECEC")
color_TableBorder="ECECEC" # Table border color (Default = "ECECEC")
color_text="000000" # Color of text (Default = "000000")
color_textpercent="606060" # Color of text for percent values (Default = "606060")
color_titletext="000000" # Color of text title within colored Title Rows (Default = "000000")
color_weekend="EAEAEA" # Color for week-end days (Default = "EAEAEA")
color_link="0011BB" # Color of HTML links (Default = "0011BB")
color_hover="605040" # Color of HTML on-mouseover links (Default = "605040")
color_u="FFAA66" # Background color for number of unique visitors (Default = "FFAA66")
color_v="F4F090" # Background color for number of visites (Default = "F4F090")
color_p="4477DD" # Background color for number of pages (Default = "4477DD")
color_h="66DDEE" # Background color for number of hits (Default = "66DDEE")
color_k="2EA495" # Background color for number of bytes (Default = "2EA495")
color_s="8888DD" # Background color for number of search (Default = "8888DD")
color_e="CEC2E8" # Background color for number of entry pages (Default = "CEC2E8")
color_x="C1B2E2" # Background color for number of exit pages (Default = "C1B2E2")
ExtraTrackedRowsLimit=500
EOF
/usr/local/awstats/tools/awstats_updateall.pl now
cat > /home/httpd/vhosts/$1/httpdocs/logs/index.html <<EOF
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="REFRESH" content="0; URL=http://www.$1/awstats/awstats.pl?$1">
<title>Redirection...</title>
</head>
<body>
<h1>Sie werden zu den Statistiken weitergeleitet...</h1>
</body>
</html>
EOF
/etc/init.d/apache2 restart
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I think that with the installation-guide of ivsdigitel and this script, nearly everybody can run awstats on a plesk-box
If somebody has improvements or better ideas, I'm very interrested in as a newbie in plesk an bash....