I'm still struggling with this - presets vs. Composer's prompts.
Think about Counterspell and Temporal Shunt. Think about Silvery Barbs and Cutting Words.
Silvery Barbs. You wait until an enemy succeeds with their die roll. Then the player announces they are casting Silvery Barbs. It could be ANY d20 die roll. How would that translate to a prompt? Every time an enemy succeeds on a d20 roll the game will ask you if you want to use Silver Barbs to make them reroll and then apply advantage on an ally?
And Counterspell. Again. If you are in a battle with 3 or 4 mage's, you could be pausing combat for each and every mage asking if you want to cast Counterspell. And like the duergar Nere fight in Grymforge, they can cast Enlarge, they cast some cleric spells too, and even dominate spells. That would be a lot of prompts until you finally decide to accept 1 - IF you decide to waste a 3rd level spell slot on it.
Cutting Words is like Silvery Barbs. It can happen at any time. I don't know how you'd pull these off without some sort of preset triggers like Selected Roll Types, Selected Spells, Selected Targets, etc. Otherwise, the game would have to pause a lot to ask if you want to use the Reaction.
You're creating trouble that doesn't need to be there. - Temporal Shunt and Silvery Barbs aren't PHB and thus almost certainly won't be in the game. - Cutting Words is already in the game, implemented according to what I call method #5 - Reworked Reactions Effects.
So the only relevant ability in your list is Counterspell. In your example against 4 mages, it's very likely that one of the first 2 mages will cast a spell you want to counterspell, using up your reaction. So we've already halved (or more) the # of prompts per turn.
In your preset example, each turn my PC mage would still have to: -pre-cast counterspell (1-3 clicks, depending on how easy it is to access counterspell on the hotbar) -preselect 1-4 of the mages (1-4 clicks) -double check that the conditions for counterspell are correct (i.e., what spell level to counter - unknowable # of clicks) If my counting is correct, that's 2 clicks minimum using 2-3 different UI systems, every turn....How is this more efficient than the game pausing 1-2, maybe 3, times between turns with: "Click the counterspell icon to counterspell [enemy spell], or press space to do nothing"?
