1. Is it possible to copy a brush from one map to another?
Eg. I want to copy a vehicle from a.map to b.rmf.

2. Is it possible to convert .map to .rmf?

3. Is it possible to create a whirlwind?
Maybe using func_push?

4. How do you make the flashbang effect?
Some maps have flashbangs popping out of nowhere at a certain point and blinding you, like one of the NBnoobgames.