Make the level all one map or use loading screens?

[Cranky Old Man]

You mean the distance between two entities affecting eachother? If so, can't you just add an invisible lever in-between that sort of carries the signal like a middle man?

No, i mean, for example, a wheel entity can be spun within the invisible map boundary but not when outside the boundary in the very same map.

Oh, that's even WORSE than hardcoded limits.
If you have any idea on how big the functional area is, let me know.