any modder comment about this?
Well if you want my comment...
It's not possible to have more than 2 rings equipped as rings. The number of available clothing slots is part of the MW engine, it's not a variable that can be modded. So any extra rings would have to take a different slot. The only other non-visible slots available are amulet and belt, and if you did want to replace those the simplest way would be to change the meshes, sounds and stats for amulets and belts (for self-enchanting), or for existing items change the item type.
If you want to use a different clothing slot, it's going to be a visible clothing slot. That doesn't mean the rings themselves have to be visible (you can make it without any biped/body parts assigned), but it means one less visible item of clothing/armor. Some slots are absolutely not suitable, e.g. skirts will replace the groin whether you tell them to or not, and robes are worse. That leaves pants, shoes, shirts, gloves, and armor pieces. You could set something up as any of those and call it a ring if you want (it will still have the sounds assigned to that item type though).
To wear extra rings without replacing anything else would require a kludgy workaround, probably by checking the player's inventory and applying ability or curse type spells for CE items to simulate the effects of non-equipped enchanted items. AFAIK there's no way with the current tools to get the effects/type/etc of a player-made enchantment. So it would only work for items that were hardcoded - ie only stuff you find in MW, nothing you make yourself. With MWSE and a lot of mucking about you could include mod-added enchanted items but never ones generated during the game (reason: you can't know what they'll do, and you can't know what the ID will be since it's generated by the game).
In short, I think the reason modders haven't been commenting much is that we don't know how to do it - at least, not in a way that would be worth the trouble or worth playing. :shrug: