Quite simply, can we have a wider range of bullets for sale on merchants like arrows + bolts?
Excellent bullets can be made by players. Buy from them.
For once I'm going to *not* suggest a ranged weapon is underpowered. I've crafted some badass bullets quite easily on a non-specialist PC. Doing Research makes it fairly obvious what to use for bullets too. The only downside is Slings are broken in NWN and aren't Mighty, but they're great Sneak Attack Delivery Systems.