I think it would be cool to have a slingshot that shoots water balloons. 10X1 or 10X2 damage, gets the enemies wet for two turns. (Water Rifle and Pistols only last one turn on the enemies.) Would let you keep up your boosted electric and ice damage for slightly longer.
Also would be nice to have a leaking rifle. The only two weapons that leak right now are a dueling and a dual pistols, but a rifle could be a better option for tougher enemies, and/or for goats that you don't want to enrage too much while you take some of their bite out.