Spontaneous Metamagic
Metamagic feats may be applied 3/day spontaneously to any spell they would normally qualify for, without increasing the spell's level. Additional selections of the same metamagic feat allows the number of times per day to stack. Any number of metamagic feats may be used when applied up to the normal spell level restrictions (i.e. cannot cast beyond highest spell level. Though the spell's level is not increased, this restriction remains).
Spontaneous casters may apply metamagic to their spells as a free action. Preparation casters may apply metamagic to their spells as a Move Action or may prepare their spells ahead of time using up a use per day of their metamagic feat and cast their modified spell normally.