Hi Alessio, First I must say you do great job with XMM.
I have thundreds of movie files with their related subtitle files. You have a nice option under "Collection Maintenance" which renames movie files. But If I do that, the relevant subtitle files become useless. (Because only the subtitles which has the same name with the movie file is loaded.)
For ex,
Old Files in folder: mymoviefile.avi mymoviefile.srt
After Renamin: My Movie File(2007).avi mymoviefile.srt
It would be nice if the file renaming option also rename ALL THE OTHER FILES WITH SAME NAME in the same folder neglecting the file extension. (Subtitle files may be *.srt, *.sub, *.idx or so on but their pure filename is same with the video file.)