1. There's a M2 for the bow.
2. What about people on laptops/people without working scroll wheels? M3 isn't possible for them.
I dont think anyone is going to play this game with the trackpad or any game for that matter :P
I play it on a laptop all the time when making the game, so I'll try to not put anything CRITICAL on M3. Maybe some stuff on the scroll wheel that's optional. We'll see!