[feature request] spell casting fatigue / gem use

[Agrajag]

The MM part is probably for all the guys who don't care too much, or already know exactly how many gems they want.
Lets say you intend to use only none-gem-costing spells, and with a mage with high magic in the required path (just as an example, a pretender with 10 in one path), would you really like to increase the amount of buttons you have to push tediously by 50%?
I guess if you had the option to turn of the gem thingy you suggested it wouldn't create any extra MM...