There should be combos for all the weapons like staffy/stabby, shooty/slashy and so on.
From what I have read from RatBeard, they are working on this. It takes time and this game is still relatively new. There are bugs and issues that need to be addressed first with combo weapons before more are introduced.
I agree with you a few weeks ago i made a post about being able to combine singular weapons with others to get hybrid weapons like combine your slashy weapon and a shooty weapon to get a combo slashy/shooty weapon