This would turn them too similar to bows though, in my opinion.
Still lower range, lower accuracy, higher damage, higher rate of fire. Yes, more similar, but still not really comparable. Especially as you can keep a throwing weapon ready as long as you want, which moves them closer to crossbows than to bows again. It remains something special, which is good.
The problem with throwing is, that it's very effective on close range, and it is quick with high damage. In my eyes the only solution to balancing it properly is by item stats only (in difference to almost every other class which can be balanced by other things, too), and those stats are among the most difficult to balance I can imagine. I think with no other weapon you can feel UP or OP stats so well like with throwing weapons.