Hi Quezler, this is almost exactly what I need for a brute-force auto-crafter that does all the qualities. Can you please add the ability to change combinator condition and output signals?

Haha, I just came here to ask the same thing. :D
Also, the extra signals like A-Z should never be upgraded in my opinion. I often use "A=1" to enable/disable inserters and having quality on the A signal makes no sense. A setting for this would be really nice.

I made a pull request that adds this feature: https://github.com/Quezler/glutenfree/pull/44
It also adds settings to disallow changing fluids and/or virtual signals.

thanks that looks good, merged with merely some code style changes.

Happy to help!

I also discovered that infinity chest filters need a separate set of API calls to modify. But also that the "upgrade" selection mode doesn't select them.

i suppose the upgrade planner cannot target entities who's prototype have the hidden flag.