Prevent setting TPing in/out of walled off "bunkers"Suggestion
I would like a way to make it so that you can't teleport in or out of a walled off area.  
After making this post, I decided to take a peek at the code and see if this is something I could do myself.  I quickly came to the conclusion, after trying a number of strategies, that detecting whether or not a person is TPing in or out of a walled off room is nearly impossible.  I would love to be proven wrong here.  

However, I did come up with an idea that will (and does) work.  Basically, i've made it so TP won't work unless the source position and destination position are both outside.  I did this by doing a RayCast up, expecting terrain, for which the sky is.  I would love to contribute my change (has a configurable property to turn this on and off), but the code on github, at least what I have found is older.  Is there a current repo?
you're welcome to message a patch.  Please make a diff from the current version to your version.