Volley Torch Marker + Multi-Arbolest
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.
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.