FlashEff only allows you to call one function at a time but you can trick it.
Heres what you'll do:
On the frame that has FlashEff press F9 and create a new function, let's call it: twoFunctions
And this function you will call your other 2 functions that you wanted to call through FlashEff.
Then go to the FlashEff panel and call twoFunctions.
Hope this helps, let me know if anything else comes up,
-Ionut