I'm all for this, so long as we make it explicit in the combat rules that you can change between primary weapons on all your iterative attacks. Right now under Full Attack it says "you can strike with either weapon first", but doesn't specify that you can still switch on subsequent attacks.
Actually, I would like to include Pounce/Headlong Rush/Furious Charge into mounted charges (I like letting melee have nice things), and in fact I'd like to get rid of the "single melee attack" on mounted charges altogether (can't the rider just delay his action until after his mount moves?) but I felt that wasn't the original intent behind the mounted combat rules. But we do need to specify what happens when the rider has Pounce and his mount is charging.
You need to be able to charge past your target, yes... but oddly enough, while this requires the mount to charge, it can't actually get an attack if it continues to move away from the target.
Technically, the Rules Compendium allows you to jump over "obstacles", so you could try Jumping over your target to continue moving in a straight line, but that would look silly. Also, the Rules Compendium never defined what an "obstacle" was, so there's no indication if allies or opponents count as an "obstacle".