Yes , this is covered by the rule I quoted on page 280, no matter the check you can only add a maximum of your force rating when it comes to adding force rating so FR=4 AND one committed die and most white dice you can add to any check is 3 , iirc it does call out you could add less. So you could add 2 dice for one effect and one die for the other as long as you don't add more.

If a player at my table asked to do that, I would say, "Nope, pick one effect." But YMMV.

Reading the Tea Leaves a little the very first sentence of the full Quick Movement description is:

from FaD p150:

"Before making a non-Force power check during structured gameplay, the character may..."

So what is a "non-Force power check"?

Is it any check that includes the addition of Force Dice: Terrify, Hawk Bat Swoop, etc.

Or is it specifically a check to activate a Force Power.

from FaD p280 under the sub heading "Combined Force Power Checks":

"Some Force powers and Force talents require the character to make a Force power check that is combined with a skill check."

I think that's clear then that if you're adding Force dice to a roll from one Force talent or Force power then Quick Movement can not be used. Scathing Tyrade ok, Terrify no.

I not even sure it could be done even if it wasn't listed as s non Non-force power check because I can't find anything on using less than the full amount of force dice, so I think using the force dice for one check means you can't use it for something else, I'll keep looking though.

Well, I suppose if one is really determined for an official answer regarding mixing Terrify and Influence, they could ask the devs.

I could see the interpretation being, "It says to add Force dice up to my Force rating...so what if I add 2 of my dice for Terrify and the other 1 for Influence?" Technically, I think, the rules allow for that.

BUT, then that just gets really sticky and complicated and messy. And I don't like sticky, complicated, messy dice pools. I like dice pools that, when they fall, I know exactly what to do with them.

Agreed. Best approach is to adhere to the K.I.S.S. principle as much as possible.

Being able to mix and match or split your Force dice between two separate effects veers away from said principle, the later especially so.