this plug was here long time ago, and removed
also, it was suggested some time ago, and denied
reasons:
+admins will be lazy to record demos and spec properly, they will ban without going spec mode.... only coz the banned player must bring the proofs here... instead the admin
+some hacks hide proofs from ss, so, even with ss, we will not see any hack.... better proof is a demo
+a lot of players will not know how to find/upload the ss, or they will lie about it