About the mass shooting. Thats kind of what I had in mind.
I thought somewhere on page one, a method was mentioned to let 10 people shoot arrows on one square and make it an aoe effect.
Heroes of Battle, page 69, Concentrated Volley.
Up to ten contiguous archers each make a full attack. Their leader makes and attack roll (BAB + Int mod + range penalties for the most distant archer) vs AC 20. If it hits, all creatures in the target square take damage equal to 1/5 the total arrows in the volley. (If the arrows deal different amounts of damage, use the most common arrow damage numbers in the volley). If the attack roll misses, the volley hits an adjacent square (determine as an off-target splash weapon, PHB 158. perhaps further away per range increment.) The target can attempt a DC 15 reflex save to take half damage.
Get ten CR 1 hobgoblins with Rapid shot and MW arrows* fired from Longbows, and a CR 7 or 8 commander (maybe a tripping fighter, so he has good BAB and okay Int; or a Wizard-based Gish). The commander makes an attack at around +9 or +10 vs AC 20. Even if he misses, he might hit another person on the board. If he hits someone, that person makes a DC 16 Reflex save to take half damage from 4d8 arrow damage.
*The Ref save DC for half is adjusted up by enhancement bonuses to hit, and down by range increment penalties, and if half the archers don't have line of sight to the target area.