I'd probably start thinking about bringing meds with you if this happens more often than not. That minor amount you recover from them not be much, but it's better than nothing. Or meld for piety to recover mp faster on one slot or two. *shrug* There's not much you can do if you die again and again due to raidwide mechanics because of party shenanigans.
But yes, I do agree, a nice boost to get the dead casters back up and running instead of just losing out on dps/co-healing is something we really need. Even 50% mp recovered on resurrection is still better than nothing.