When I'm finished with the mod I'm currently working on, I've been considering adding some new tools which perform multiple roles (but not as well as specialized single-purpose tools) if I can figure out how to do it. For instance, an adze which would be both broad axe and shovel, but doesn't count as a sharp tool for harvesting and makes a poor weapon. Or a shoulder saw which acts as a woodsman's axe and carving axe. Or a mattock which can be used as a good two-handed weapon, but also acts as a splitting axe. And so on. I like the idea of being able to mix-and-match tools according to need, preference, skill, and weight.