I don't know if what is needed is a mod, hack, both, or none. 

TS3 is full of rabbit holes and I was wondering if a hack or mod could be made in order to make an object like a door or window do all the things a rabbit hole does. For example the hospital, hack a door into making the sim think it's still the big hospital and not just a door but that can be placed in any community lot or residential lot. The hacked object would not interfere with the sim in any way unless selected. If it i IS possible, could this be made for every rabbit hole 

i have searched MTS, Google, GoS but nothing came up.

example of a door that could be used