Although I semi agree with this. That'd put surf and waterfall in that same category. We all know they aren't "Useless" moves. But, they'd be field moves nonetheless. So, there's a happy medium, and we've had it since the creation of the game.
^ THIS! Only thing is, you may not be able to use the HMs unless you switch!!! Forget it! Better idea!!!! (See above) Originally I was going to say you could have any HM move but can't use them in battle unless you set it to allow you too but you'd have to give up 1 of the other 4 moves to do so.I wouldn't like it to be honest, BUT... I wouldn't mind if HMs weren't counted as one of your 4 moves.