As an aside, I think any game company (not just Catalyst) that is a) making a game that has fairly complicated character creation rules and b) intends to have an app to do that character creation or license one (e.g. Hero Labs) should do all that app work BEFORE they released the game.
I say this because there is nothing like trying to turn your rules into a computer program to find any weirdness or errors in your rules. Just give the coders the text, let them go to town, and you'll have your first 10 pages of errata before you even publish the game.
I'm not blaming Catalyst for anything here, this just hadn't occurred to me before. Probably ditto for any actual play tools. Practically its unlikely to happen, I suppose, because of the economics of it all; you don't want to invest in the software development until you are sure that you have a game that is going to sell. But it would be a good way to check the logic and content of your character creation rules text.