Some suggestions in no particular order.
Change Manyshot to a stance: -4 to hit. Toggle on or off like Combat expertise. (This is how it works in pen and paper)
Add a few ranged feats:
- Ranged Pin (Usuable like trip with same cool down):You must succeed on a Ranged Attack and then win an Opposed Grapple Check (size modifier still apply). If successful, you opponent must make a strength check vs. DC 15 to become free. (He can still attack just cant move)
- Zen Archery: You use your wisdom mod instead of dexterity mod when making ranged attacks.
- Crossbow Sniper (Pre-Req weapon focus): +½ Dexterity modifier damage and doubles ranged Sneak Attack range to 60’ (instead of 30’).
- Efficient Pull (Pre-Req bow strength): Treat your strength as 2 higher when using a bow.
- Improved Rapid Shot: You can fire ranged attacks even faster then rapid shot and reload faster then rapid shot when using a ranged weapon.
I think these few simple changes would cause a ridiculous amount of happiness among the ranged crowd and allow for some very interesting builds.
In addition I would consider adding to the deepwood sniper line. I think hail of arrows would be a fun ability but no idea how you would code that although it would look fairly impressive in very rare certain circumstances. (And also generate an incredible amount of much needed aggro every ranged attacker loves.)