Hey Damien0410-
Where are you using your while loop? It looks as though you should be able to include a while loop just after the MultiGate to get the effect you want. Just make sure you as setting a bool variable to true when you click the right mouse button (bIsHeld) and then setting it to false when the button is released. then use that bool as the condition for your while loop. You will likely need a while loop for each of the outputs from your gate.
Cheers