How unbalanced are my rules for scrolls?

[sleepyphoenixx]

Scrolls taking the same action to cast as the spell they mimic is standard as of Rules Compendium.
That's how i've always played it and i've never had any trouble. Sure, they can be useful, but that's intended, not broken.

As others have mentioned the people who usually benefit the most from scrolls and wands are UMD users, not full casters. So if anything it improves balance instead of making it worse.

If you want to really hit them, take away the rule "Spells from scrolls are cast at the CL of the caster, if it is higher then the one of the scroll", limiting heavily the real advantage full casting classes have over other archetypes when using scrolls.

That's not a rule in the first place. Only staffs let you use your CL.