Just to end the speculation, Yes it is acceptable PROVIDED you do not use this as a way to harass someone (doing it repeatedly to grief someone, killing n00bs that looted an awesome weapon, or if someone asks you NOT to do it). If it becomes a problem and someone requests you not kill them after the round we will issue a warning to refrain from tking at the end of the round then it becomes kick/ban as needed.
Essentially this means screw around with friends, dont rage at someone you dont like.