type "help sneak 0" to find the id of some sneak improving magic ability (starts with MGEF, not ENCH)
and "help "Gold Ring" 0" to find the id of a ring
finally type "PlayerEnchantObject ringid magicid (optional second magicid)" and it will create a item in your inventory with those magic abilities
some abilities have no description but do work.
Thats the best way to create allot of fun to play with items, afaik you cannot influence the magnitude of the enchant on them items.