Make RDM slays be on a map by map basis, instead of a session basis, and make it last a map's length of rounds(AKA if slain on round 3, they would get slain twice for RDMing on round 2 of next map still) AKA if someone RDMs on round 2 of a map, then on round 5, slay them once for the first, twice for the second. If someone RDMs on round 4, then on round 3 of next map, same thing. But if someone RDMs on round 1 of a map, then on round 4 of another, they shouldn't be slain twice for the 2nd RDM just because they'd been playing for 2 hours. Most mods/admins already only do one slay per RDM, but some mods as of late have taken to slaying twice quite a few rounds later just because they had been slain for it earlier(No, this isn't about me, this is about someone I saw this happen to today and thought it was unfair).
I could get behind this, but your 3rd RDM in a play session would result in a ban for 3rd offense of RDM.