Perhaps the feature I'm looking for already exists.  I have an assembly with doors, and I click and drag to pivot the doors.  Right now, the door will swing into the model, which obviously wouldn't happen in the real world.  When I have to close a door, I create a mate to get to door in the correct position, and then suppress the mate.  To close the door, I unsuppress the mate.  This is purely to check clearances and to keep my model in the correct position for drawings.

I know that collision detection already exists, but is there a way to set it to automatically run while I'm dragging parts around?  Better yet, is there a way to turn it on and off with ease?  Better still, could I set this enable/disable command to a hotkey?  My ideal scenario would go as follows:

1. I need to close a door to check clearances or something.
2. I enable the collision detection, preferably with a hotkey.
3. I drag the door closed, and it stops when it comes in contact with the doorframe.  There are no mates at all.
4. I disable the collision detection to continue working as normal.

I think this would be cool!  If it doesn't exist, it would be a cool feature to add.  Thoughts?