The rules say that rosters are frozen between now and the waiver draft, but that's not really necessary.
We'll just mandate that any trades of MLB assets be equal (1 for 1, 2 for 2, etc) so that the waiver pool is constant and unchanging right now. Waiver pick swaps should also be equal on both sides.
We will continue our practice of "dissolving" any excess picks as soon as the first selection is made in the draft (only one person has an extra pick right now - Gibbers).