you have to add nation rules first, then basically add all the leagues that are in whatever nation, then within that league you can change any rules you want (loan rules, number of teams in each league) etc..
I will upload a first version tonight, I dunno when it will be available though, it needs to be accepted by admins or something and I have no idea how long that will take.
Some stuff i found:
Lots of FM 13 players are free agents like: Santon, florenzi, corchia, pastore, borini, pato, luiz gustavo, benatia, van der wiel, nainggolan, bender, palombo, nastasic, schelotto, nagatomo etc..
cordoba and toldo (inter) started the game with expired contracts and were able to sign multiple contracts with a lot of teams, this looks like some weird bug
cristian vieri in player info is named "male2" and is french