Well, this is my first suggestion, so it's likely going to be clunky.
I'm suggesting three phase related commands.
.ph Reset - A command that will simply reset the phase, removing all objects npcs... everything. It just wipes it completely so the phase owner can start again from scratch if they're not happy with there phase.
.ph CreateExtra - A command for donators. Allows the user to create a second phase to use with how they wish.
.ph Delete - This is for the donators in intention, and is related to the extra phases. It allows the user to simply delete the phase they own.