you actually can play FGE with 2.5 as it uses its own files for buildings and units...the building organisation is slightly different from vanilla RSII but you can look in the starting thread whats different and how the Oppidum/Barracks upgrades and unit availability (republican,allied cohorts and allied local troops) works in a more natural plausibe and coherent way...look here under Roman Recruitment depends on romanization
http://www.twcenter.net/forums/showt...77#post8599677
If you have questions just post them in the FGE general discussion topic
RSII "Five Good Emperors" Questions, Suggestions & Discussion
While some nice changes were made for 2.5 I still prefer the old traits system as I based the economy balancing on it...as well Iam not to keen to get this election thingi popping up every few turns and have restrictions on those characters who can get a legion ancillarys etc...right now the game is literally bug free and its real challenge consists in finding the right balance between moderate but constant expanison while developing a military machinery which can be financed by homogenic developed citys with enough income and good governors to provide a more prosperous enviroment...its more strategic empire building than any RTW game/mod ever was...but beware...your opponents will put up very stiff resistance and if you fight in to many theatres you will face an attrition war which you easily can loose