Just try using them. Pop-booming isn't really required in SP games, or at least I've never needed it on Transcend, but that's usually on bigger maps. Perhaps if you had Santiago, Miriam and Yang breathing down your neck right off the bat, you might need it.
As for crawlers, you might want to try it with targeted research, just so you can beeline for Industrial Automation (B3). But that's just to show how you can completely outplay the AI with them. Whenever you get IA, just start cranking them out. You'll immediately realize how awesome they are. And don't forget that you can later cash them in to rush Secret Project, so it helps if they can get back to your bases quickly.
Good spots to use crawlers are any squares producing a lot of just one resource. So a flat, rainy, nutrient square with a farm and condenser is 7 nutrients (7/0/0) if I recall. It makes far more sense to have a Crawler collect the nutrients, then work a Borehole (0/6/6) instead, since you can only have one crawler assigned to a square at once.