As I took a couple of hours to check BT I 
will comment this have some not-
intelligent implementation in Act 2 
(secret boss área) and on Level 24 
"Falling Ground" (which seems to use too 
many code lines imao). Also during Act 1 
end, when we add the stratopod...

In other words, you delete a wall and 
create a corridor to An already mapped 
room. Definitely doable, just complex, too 
long, and no one really willing to do 
it...