Erm not too sure mate iv never seen it done but then again i dont really know an awful lot bout editing had a bad experience once so never tried again haha
You could swap the EPL with the SPL. Take all teams out EPL and replace them with 20 SPL teams. It would take alot of work and would totally destroy the new EPL but worth it if you want to play with SPL teams.
No, you can't because it's hard-coded, although the EPL idea sounds not bad. I would like to keep it as normal for all the other leagues. But on FM10, although it would be quite complicated with domestic cups etc., it could be done.
Scottish leagues are a joke. They really should look further into SPL2 and grow a pair of balls and send the old firm down to England so the leagues aren't dominated by the big two.