That would sorta be bad, I mean you manually regenerate grace by praying, and it will only refill to 50% on its own. Really it would only benefit sorcerors more. There are many items which give magic+1 (this stat makes you regnerate SP faster, not GRACE). There isnt anything that will speed up grace regen besides one god which I cant think of the name right now.
Also, there is a little known lvl 99 spell called "regenerate spellpoints" which costs 0 (ZERO) sp to cast and it fully recharges your sp...
Moral of the Story: Get your magic sub-level to 99 and your god.