To this date, I cannot understand the necessity of most RPG games to
give the player a chance only to wear two rings. One in each hand.
Now why is this. Of course first of all (in here) it would be a
tunewise issue. somebody with 10 x maxspr ring would be kinda uber.
BUT - why dont you categorize rings by their power, size and restrictions.
For example, one ring type could be unique-wear. You cannot wear more
that two of the same type. Some rings could only be worn in your pinky
or thumb, and would be much less powerful.
It could calculate if your regen / stats / bonus from all your rings
exceed a certain amount, you cannot wear anything that has more bonus
to that area.
Alch rings could vary in size also as in power. You could have small
resist rings, powerful regen rings, etc, all worn in different fingers.

Adjust the current rings so that they are max two of the same, and thens
start creating new rings that can be worn on other fingers, but with
restrictions and much less powerful. And they could be random drops.
(oh, and barsoomians would get fooked, like usual)

~/A