I specifically coded the professions in such a way that they can be expanded without breaking save compatibility, so yes, there are plans for more functionality. One thing that I like the sound of is giving some sort of skill buff, except I haven’t quite settled on how I’d want to implement that yet. I thought that just boosting skill comprehension would work, but then I looked into things, and realized that it didn’t do what I wanted it to.
I also kinda want to put in a profession that starts with some kind of bow or the ability to make one, since they’re annoyingly hard to come by, and the skill book only gets you to the point where you can craft arrows, not bows themselves.