I am trying to make it to where i can toggle the booster ability for D.VA but i’m having some issues. If anyone can help i would really appreciate it.
I want to make it so when i press her booster, it will keep going until i press it again.
You can try checking when D.Va uses ability 1 and then making the cooldown really low. after that you set action to toggle the ability until d.va presses the ability 1 key again [you can check that by checking if button is held] If you want I can explain it in full detail 
Edit: I tried recreating what you wanted. Sadly it only worked for 1 extra booster for me 
so I am not so sure
Yeah i had a similar issue.