Fingerless and spell casting

[Sapare]

Curious what the default(not realistic deficenices) ruling is for casting spells with Verbal (V) components while wielding an object(primarily weapon) in your mouth. The way rules are stated I assume this is not a problem, but I am a little bit unsure what balances a pony mage down, Fingerless seems to have very little affect on them.(even without unicorn hands) What is the main drawback of fingerless for a spellcaster?(Though still new to the game so I might be misjudging their balance)

[David]

If the spell need a material component and your mouth is full, you're out of luck, to start.

This makes casting many spells with a rod impossible.