Given your feedback, I will propose an alternative to handling dice rolls.
If I do all the rolls in house, you'll need an efficient protocol to inform me of your intents concerning action dice.
I can't post the result of a roll, wait for you to tell me if you want to use an action die, then roll the action die and post that result. It'll take too damn long!
Here is what I propose;
When you describe your actions in game term, write down the modifier of the action you're about to take and add an asterisk * next to it if you wish to activate an eventual should it occurs.
For example:
[I shoot the goon with my pistol; +5*]
That tells me your attack modifier is +5 (it saves me the time of looking it up) and that should you roll a critical threat, you wish to activate it.
If you intend to use an action die to add to a skill check, we'll use the following protocol:
X/Y followed by an S or a O.
X tells me how much action die you are willing to spend, Y tells by how much you need the roll to fail before spending action dice. Adding S tells me you are only concerned with success while O tells me you wish the highest success margin possible (useful for certain driving maneuver).
Exemple
[I shoot the goon with my pistol; +5 (1/3 S)]
This tells me you'll spend an action die if you fail by 3 or less. If you fail by more, you don't want to waste an action die on a lost cause.
[I shoot the goon with my pistol; +5 (2/8 S)]
This tells me you'll spend up to 2 action dice if you fail by 8 or less. You'll spend only one if that's all that is required.
[I make the Red Line driving maneuver; +5 (2/8 O)]
This tells me that as long as you are not losing the check by more than 8, you will spend 2 action dice. You'll spend them even if you are winning the check because you want to win this check by the biggest possible margin.
[I shoot the goon with my pistol; +5 (3/- S)]
Finnaly, this would mean that you are willing to spend up to 3 action dice, no matter by how much you failed. You are willing to take your chances. Basically, you want to succeed at all cost.
Do you understand what I mean? Would you prefer this?