Engineer in its current state is fine, except for rr, wrangler, short circuit and frontier justice, 3 of which we ban anyway. I don't think giving engy gimmicky abilities to make him useful all the time is a good idea nor would it even work cause at the end of the day he is tied weakest combat class with spy. His utility would have to be crazy to be worth running full-time or just a lot, and utility in a game like tf2 tends to be annoying and trash or annoying and op, like airblast.
tl;dr no lol (at least imo!!!)