Volley Torch Marker + Multi-Arbolest
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A suggestion from AoC a long time ago.
Volley torch marker: Grab a special torch from the map, throw it on the ground somewhere. Where that torch is laying is where a shower of arrows will be shot at from above the map.
Multi-Arbolest: http://www.youtube.com/watch?v=1MBx-ag5tfE
A long loading multi-firing ballista. Mainly for tightly packed groups. Fires the normal archer arrows. Should have moderate accuracy so it could cover a fairly large area from atop of a castle wall.