Yeah, an engineer would probably be required to be able to pilot one. And even if they weren't required to pilot one they would probably know how to anyway because they can build them in their sleep so they already know what everything does.

Just be warned, we will [i]need[/i] a flamethrower, even if its just an improvised one, at some point in the story so be ready to build one at a moments notice if you're our engineer.