Allow staff to customize Rm101 teleport-back distance

This issue affects Staff

How this differs from the expected behaviour

Prior to update, players could walk freely within the whole rm101 area. For many rm101's (i.e. the odd ones with no roof) it is understandable why the teleport distance is set to 5.

How the issue manifests itself

This is an issue specifically for my own Rm101 (/rm101 warp Mechman007) and others utilizing a hidden rule board - At the back of my room, I have a rule board (circled in yellow) that is not accessible/visible until I pull the lever. Since this is further than 5 blocks from the rm101 location (green circle), players get teleported back when they are asked to re-read the rules in the room.