As cm_RenameOnly switch only between file full name and file name to edit it, it would be fine to switch to the file extension too.
1. File full name
2. File Name
3. File extension (after the last dot)
4. go to 1.
mf
Third mode for 'cm_RenameOnly': File extension only
Moderators: white, Hacker, petermad, Stefan2
Third mode for 'cm_RenameOnly': File extension only
Bankster - Word of the Year 2009