Applying multiple aspects with the same spell or potion (power 3 for fragile aspects and power 4 for sticky aspects) is a common house rule. A similar rule is the ability to target everyone in a zone with a zone wide aspect maneuver, which would allow you free tags on everyone you managed to hit.
Both of these house rules are somewhat 'dangerous', as they change how the action economy works.
On the for argument:
Wizards, especially as they become more powerful, become less and less interested in doing aspect generating maneuvers. This is because each point of mental stress becomes useful to generate a very powerful attack or block; a single aspect is hardly worth the trouble when you could be hitting someone with a power 8 (or much more) attack for that same point of mental stress instead.
So, wizards need some serious incentives to ever want to use magic to do maneuvers.
Against:
Wizards are already one of the most powerful builds in the game, giving them the ability to generate a whole lot of aspects at once both violates the action economy and gets them even more power. Especially since all the other builds don't generally get access to the same sort of very high power effects which would allow them to play the multiple aspect game as well.
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In general, I'm in favor of allowing wizards to do this, but at the level Belial tends to use it for, I'd probably throw dive at him if he were at my table.
