How unbalanced are my rules for scrolls?

[sleepyphoenixx]

Do you mean that it counts toward the old "quickened spell" limit? I'm unfamiliar with a 3.X rule limiting the number of spells per round. My understanding is that you are limited only by your number of actions

The limit of 1 quickened spell per round still exists. It's right there in the feat description of Quicken Spell.