"4) All moderators are asked to not mod games for players on probabation."
This is difficult to put into action, since it requires all mods to know who is on probabtion. Also, it unduly punishes an opponent who might require the game to be modded by a third party.
I think points 1, 2 and 3 are definitely workable. I would also propose that a major infraction should be voted upon by the committee and not the sole decsion of a mod. The mod should simply issue a warning and refer the incident.
My remark about moderators was on vickalan's suggestion to ask moderators not to mod games for these players.