Some of the Wizardry games did as well. And I think one of them let you import characters from Ultima 3.
At one point in time I had found a list of games that supported it, and it was tiny. I didn't know the Gold Box ones let you, or maybe I thought only Pool of Radiance to Curse of the Azure Bonds let you.
That brings back a memory of some friends of mine. My friend had Curse of the Azure Bonds on his C64, and one day I was over there playing it (had just started a game), and my friend who owned it said I had gotten further in one day (of playing it for maybe 2 hours) than the other friend had gotten in a week! He really sucked at RPGs. We played Wasteland at his house, me on his old crappy PC/jr with CGA graphics and he on the newer VGA machine, but since he didn't know how to balance his party out, he constantly died, so he copied my saved game and played from that!
Good times!
slaapliedje