It may be an idea to have threads based on certain sections of the games like editing kits, players etc. Seems this (single) thread will suffice for all questions on all star issues.
As default, the all star teams in PES3 are picked randomly. In edit mode, you can set the team but random mode seems an interesting option. You can start an all-star match and hope that you get good players.
If any player commits a foul, he will get a booking - doesn't matter who he is.
WE United and PES United are built of random players who I've never heard of. Seems they are there to be edited by us into Southampton, Grimsby etc. These teams do play in ML and if left as they are, will give you a tough time as some of their players are quite good.