Not sure if these have been picked up or are intended, but I present these to you:
• Godmode shouldn't let other players cast spells on you
• .gob autoselect - You automatically select a gob after spawning it.
• A compression of commands (if possible): .cheat god --> .god, .cheat fly on/off --> .fly on/off, .mod money --> .gold or .money which give the maximum amount
• .ph own - You join your own phase, much easier than grabbing your own phase id then entering it.
• .play or maybe even .stand - A simpler way to play emotes/animations.
• .ph text - Display yellow text across the center of the screen kind of like how raid warning works. Imperative for DMing.
This is all I have at the moment, I'll see what I can find and suggest.