Corpse camping is not against the ToS when playing on a pvp server, and if you get camped on a pve server well it's kind of your fault anyway :P

The only thing i have ever been warned about in regards to camping someone is is killing the quest guy they were trying to talk to just to keep them around long enough to kill them again. Of course this was me killing an 80 pally that had camped my 58 shamans numerous times right after they entered outlands.