I totally agree 100% with OP, Would stop players delibrately supporting friends/rivals etc on a regular basis. I sometimes watch opponents games and +/- 2% possession to a team that may help me gain a favourable result in the league for my team, but at the same time give fair play to my rivals in my leagues/cups. I got strong players in my side and usually play a "balanced" formation to get optinum results for my team without too much possession bonus, A good example of this would be I played a Champions League Quarter-Final 1st Leg away from home, Other team had 13% possession bonus, but my team won 5-0.