Drowning for Health Purposes
should include a rule to allow you to STOP drowning...no such rule currently exists.
Rule 5: Dead is Dead
Currently, a dead character is, by the rules, merely unconscious and paralyzed, which allows them to take purely mental actions: you can play a dead Psion, if you so desire. Add the following.
[i]A dead character is rendered unplayable until returned to life or retired from the game. Such a character can take no actions (including free actions) whatsoever, save a mandatory full-round action each round used solely to gently decompose over the course of several weeks.