Most of my wants and issues seem to be covered by previous comments here.
Maybe a way to select between gaining in one point-type or deducting from a different point-type? (off-on-alt(x) selection-toggle?)
Basically, some way to attain 'Gain 2x+3a' || 'Gain 2x+1b' || 'Gain 2x+2c'
Hopefully without making several different options.
Alternatively, maybe make a multi-select option? Basically, you make a few different options and link them into a single one, where clicking it will change it to be the next in the link until it is deselected. That way, you could have something like 'Volume Increase 1,2,3,4,5 @ 1,3,5,7,9' points. Each could have their own wording. I assume this would actually have a lot of utility.