[Request] small subtitle file check

problem:
I often download tv shows in rar format, and then download a .srt and give it the same name as the .rar file.
but sometimes xbmc does not find a subtitle, because inside the rar the movie has a different filename then the rar itself.
I have 1 TV episode in each folder, with 1 .srt

A solution would be a script that does something like this:
if no subtitle found, count movie files and subtitle files.
if both are equal to 1, use that subtitle regardeless of the filename.
to have a script like that autorun when playing a video would save a few clicks

=)

never mind.
edited the xbmc sourcecode instead of a addon.