Oh, yes, Avernum and Geneforge are the best rpg/adventure games out there period. Go for Avernum 1 first, since the stories are actually really interesting, and the three first games had the best gameplay by far. It will look kind of basic at first, but you will be amazed at how the world just keeps expanding and expanding. And it's really funny at points too.The keyboard helps a bit, especially when you get to larger battles (like a couple of demons that spawns their own horde at you), but it's not uncomfortable with the mouse. Just takes longer.
I didn't think there was anyone out there who had played any of these games other than me. They are the best, far better than any RPG games developed by the big studios. They are also fairly cheap and the demos are like 1/6th of the game, so you can play for free for a long time to decide if you want to pay for em.