For better identification record a demo next time and also type "status" into the console, it will give you the SteamIDs of all players. While playernames can be changed easily, their SteamID is unique.
I don't actually know how SpA handles ban requests, but a demo is always a good way to distinguish good players and cheaters. Although it still can be hard to tell sometimes if it is really a cheater, a demo is far better than a screenshot

(Preferably a demo taken as a first person spectator of the suspect)
[/wannabemod]
