Can we have towers that launch AoE grenades or some other area damaging weapon? It would be a great excuse to implement grenades and make a really powerful tower.
The tower, however, would have a short range and low HP and ACs, but should be able to return fire from a distance.
I think it could work well to split up an enemy during an attack instead of just cramming the guard towers around the main one so they can all do damage against a blitzkrieg warfare style.