If you want to do that you can steal the jump gun mod and rename it. Although it would be abusable...
well if you played minecraft you would know that the Enderman teleports not jumps across the map,
if this were to happen they might splatter them self on the top of the nether portal
I like how you made those custom player types, and expanded them instead of just making one or two and then doing nothing.
same here

4 that, if his up for it can he make:Man pig(Main population of the neather), skeleton (1 or 2 Emmies that shoot projectiles), zombie (slow lot of health)