In other news, "blah blah blah blah blah"
It's unbalanced in that it's a touch attack, and ignores all armor. The image of a hasted Rogue9/wiz1 doing 20d6+4d3 damage to a red dragon each round, AUTOMATICALLY (assuming he breaks through SR) . . . disturbs me greatly.
And he's doing that with two 0th level spells + a potion of speed. No save involved. Probably needs a '2' to hit with each attack.
No, that's not unbalanced. Not at all.
On that subject, it's all extremely unrealistic that a melee TOUCH attack somehow does sneak-attack damage. Precisely how is this done? What is the mechanism? Just curious. Did you touch him in a ticklish spot? I know that realism is not supposed to matter in a combat system that ignores facing, but that's what Rule 0 is for.
As far as you sticking the dagger into the red dragon, I prefer to not ignore the following rule, unlike just about every DM and player out there:
"The rogue must be able to see the target well enough to pick out a vital spot and must be able to reach a vital spot. The rogue cannot sneak attack while striking a creature with concealment or striking the limbs of a creature whose vitals are beyond reach."
Unless rogue-boy is standing next to the dragon's head or neck, he's not doing sneak-attack damage with his f'ing dagger. What, you're going to cut off his big toe for 10d6 pts of damage?
Incidentally, this gets my vote for the most ignored passage in the PHB. How many of you use it?
By the way, sorry if my tone is . . . harsh

. I didn't mean anything personally. Just a lousy day at work. And I really *do* think that this is one of those calls that's just . . . plain . . . dumb.
Next up: wizards crafting Wands of Fireballs at 5th level, due to the new Caster Level rulings.
PS -- Icebear -- the dagger sticking in the dragon is either highly magical, or it's not doing much damage in the end, because of the dragon's damage reduction. And you actually have to pierce that god-awful tough hide.
With a Ray of Frost, you get to ignore damage reduction with a 0th level spell. Do double damage. And ignore the armor completely. Yay cantrips!