How to handle redundant Custom Abilities?

[Redcap's Corner]

I have a non-unique Custom Ability that just grants an additional use of the ability each time it's chosen. I'm sure there are other abilities like this in the game, but I couldn't find or think of any from which to pull code. Weirdly, selecting "Show in Tracked Resources List?" and setting "Automatic Calculations" to "Active Copies" doesn't seem to do anything, no matter how many times I add the ability to the hero.

That's an easy enough thing to fake with an eval script, but there also doesn't seem to be a First Copy for Custom Abilities, so I'm having a hard time working out how to pull the User.Tracker tag off all but one copy of the ability and add Helper.SpecUp to all but one. Am I going to have to resort to foreach trickery with custom tags?