Well, I was exploring things with explode, modifying it's protounits, and transforming the units.
But, besides finding things like that the effect only lasts as long as the Sphere AND Sphere effect are alive (it will NOT explode if they die early, all the units will just drop out), I found that, if you set the sphere to one of the pestilence sfx's, then the units will never go into the center, they will continue buzzing around the center and shrinking to a very small size, this will not end until the time limit for the gp.
And as a side note, I managed to make a Banishment GP from implode and transforms/modifies that looks like a Tartarian Gate, and kills units inside with no corpse left over that go inside, while not damaging any buildings.
[This message has been edited by L33TSkillz (edited 01-08-2010 @ 09:51 PM).]