[@Oddsbod]No problem. Even if they had regenerating magicka there would be ways to balance it out. When it comes to healing magic and devices [i](like Mercy's staff and the Medic's Medigun)[/i] there are certain limiting factors that prevent their abuse. 

	Devices/Magical Artifacts require a power source or a charge, abuse of them will run them dry and may even cause them to break. Sometimes for good. Healing spells and abilities, while useful in the heat of battle, can only do so much. You get cure moderate wounds cast on you after eating several bullets and your injuries will heal, but you'll still have several chunks of metal in your body that are probably going to need to be dug out.

	Not to mention the crazy diseases, infections, curses, and maladies that can't be fixed by healing magic.

	At the end of the day having proper medical supplies and items is important, and can't be wholly replaced unless you really wanna tempt fate. 

	But having limited mana will make things more fun and seeing your character try all the weird items they can find to restore their Magicka will be awesome.