The only things I have done is to rename files to games in which they were reimplemented. For example, Battle of the Bulge leaders got renamed to Dragon's Teeth and Eastern Front Deluxe got renamed to Fire in the Steppe. I didn't change the extension ID's, so if you have an old game leader extension and a new game extension, there could be a problem. The other thing I did was to delete base images and put all the leader images on one layer (which is always active). This is to prevent 2 translucent layers being stacked when the leader is hidden (otherwise it is hard to read the numbers).
Have you got extensions like:
- Australian Afrika Korps and Kokoda Campaign leaders?
German or Soviet Eastern Front Deluxe and Fire in the Steppe leaders?
German or Soviet Road to Berlin and Fire and Sword leaders?
German or American Battle of the Bulge and Dragon's Teeth leaders?
Japanese Guadalcanal and Kokoda Campaign leaders?
Polish White Eagles and Deluge leaders?
Those are all the renames I can think of at the moment.