I had a design for him where I gave him Intangibility instead of Portal Defense, since he can actually walk through walls, too, which isn't represented here, so I think that, or something like it, should be on there.
I also had this, which seems slightly more useful than what you have, but if you want to keep him "lame," nothing wrong with yours.
DARKFORCE DOORMAN
After moving Doorman, or when a figure you control ends its movement adjacent to Doorman, you may place the chosen figure on any space within 3 spaces of Doorman.