I've heard several people say that even just a code system (or save game / reload) would have made the first 2 Shadow of the Beasts more enjoyable / less impossible. ;-)
(Probably not possible, but a "save state" in whdload would be pretty incredible now that I think about that..)
Some of the early ST (or even 8-bit) ports could have used some graphic upgrades.
I love the early RPGs (pools of radiance, etc), but the graphics really made me think I was still having fun on my C64...