Nifty little thing this would be.
Its a small gun similar to the portal gun (would work similarly too, code-wise)
(crappy)Concept:

Fig 1: Shoot the warptal at a surface. (Wont work on portal proof bricks)
Fig 2: Jump into it to be propelled the direction the warptal is facing (Up if it points up) and the direction you are facing!
Can have up to 5 warptals out, you could press the clear ghost key to remove it. Has to cool down if you shoot all 5 without clearing.
Uses:
Handy trap
Handy escape
Tool for getting around
Thoughts? Anyone like? Anyone might make?