It's been covered, debated and argued many a time mate. At the end of the day FP is about doing watcha want to do, and that means no set class restrictions. End of.
Admins are alway on the look out for team stacking, totally unfair steamrolls (avanti

) and anything unless that seriously ruins the gameplay for everyone. As much as i hate snipers (god do i hate snipers) people have fun playing the class and are entitled too. Even if there are 4-6 on a team.
And you can't get anywhere near the next control point.
And you are so frustrated you may just spit blood.
We'd like to encourage players to get around it somehow. Personally, i suggest ubered scouts.
Panic time bitches!