Switch-Activatable Checkpoints
The concept is simple - make checkpoints so that they can be activated by a switch.
No more having to break things in order to teleport somebody somewhere - just rig up a switch to the new checkpoint and you're on your way. No more having to move your checkpoint in survival challenges either - you can just activate another checkpoint above the start gate. Plus, imagine the possibilities- I just thought of a Level That Plays Itself using the device and clever ways of murdering sacks.
Your thoughts?