The shortbow - what is it good for?

The shortbow is the longbow's pathetic little sister that no one wants to pick for the game. Both are martial ranged weapons, no difference. The shortbow does less damage, and has shorter range. It even weighs nearly the same, so that's no difference.

It is a bit cheaper, so at low levels may see some use. A longbow also can't be used from horseback, but a composite longbow can.

I am left to conclue only misers use a shortbow.

What I'm looking for is to change the rules to make longbows less of an obvious choice. I want to make shortbows preferable for mounted warriors and hunting, and longbows less useful.

I suggest the following changes:
* Longbows become Exotic, not Martial, weapons.
* Composite longbows cannot be used from horseback.