The point of this thread is for people to ask small questions that aren't important enough for their own thread, but good enough to be of value to know.
Any question related to ZDoom editing could fit, provided it isn't too vague or wiki-able.
To start, I'll ask:
How do you make decorate monsters act like bots? Like with behavior including shooting while moving, jumping, and complex movement. Dudukrazy's Guns had some helper marines that moved like this. (don't just say "look at the code," the intent is important too.)