I made a quick peak to the latest cvs source code, and this seems a simple enhancement (with huge advantages, at least for most portuguese users

).
From what I understood the IPFilter.cpp mantains the filtered IP's, but it's the responsability of the other components the call to check (IsFiltered). This way, the change required would be in PartFile.cpp, adding a new boolean attribute (allowFilter), and instead of calling IsFiltered, call allowFilter && IsFiltered (if allowFilter is false, it wouldn't check filter).
If I'm correct, then the hardest part would be making the GUI (which I understant nothing ;():
- Add to Context menu "Don't ipfilter this file"
- Show that the file isn't filtered (e.g. put the background color yellow in the line of the file)