Help with subscene and pump triggers needed!

[degrader]

Hi everyone.
I have couple of questions:
1) I have button which loads either subscene 1 either subscene 2 (loadfrompath).
Is it possible to have something like "merge mode". For example If I will change appearance in subscene 1 so it will stay in subscene 2.

2) How do pump triggers even work? Do they work only with built-in collision triggers?

Thanks