I have been thinking of ways to increase the viability of using a one handed build, with an empty offhand and have come up with a couple of ideas, below. I would appreciate if you advise as to whether or not there exists a mod that does either of these or a helpful pointer as to how I might go about implementing myself.
1. The first is by penalising having a offhand in use. For instance, if you are holding a shield you are going to be a lot slower and use more stamina.
2. The second is by making it so that you can't change your weapon or shield equipped during combat. How realistic is it that you can pull a shield out in two seconds. Having the off hand free means you can swap in a spell at the penalty of lack of blocking. Having the free hand full means you can't use it and it will have to wait till after combat.
I would love to hear about how I might bring this into my game!
Thanks,
S