Application Extension Mapping Disabled

[qcomm]

Using Plesk 7.5.6 for Windows, with MIVA Merchant 5. In order to get MIVA to work I had to bypass Plesk, and create an application extension mapping in IIS for MIVA script files (.mvc).

Anytime a sites FTP password gets updated the mapping is changed from ALL VERBS to to Limit to: 5.

Is there anyway to stop Plesk from making this change?

Any help would be appreciated.