You could add a skill for certain guilds that allows you to wear up to x amt
of rings and gain y amt of benefits, depending on % trained. Just make it
fackin' expensive to get more than 3 or 4 rings, and put limits on stacking.
Really, would +4str/+5con/+4dex/+3avoid, solely in rings, at the cost of 5 or
6m exp, be that bad or out of tune?
In otherwords, lets say you train the skill to 30%, that would allow you a 3rd
ring slot with max +1 benefit. 40% would allow max +2 on 3rd ring. 50% would
allow max +3 on 3rd ring. 60% would allow max +3 on 3rd ring and grant 4th
ring of max +1.

Only your first two rings can stack, just like normal. No other rings are
stackable, they must benefit different stats.