It's been a while, but I'm back.
I figured out how to shrink all my games to 256kb, which lets Action53 compile properly. More importantly I found out there's a huge leap in price if you have to order a Mapper 28 board that's 4MB instead of 2MB. So....2MB it is!
I've compiled all 7 of my games onto a single ROM that I'd like to sell as a physical multicart later this year. There's a configure script called "example.cfg" that lets you alter the title screen, title text, menu text and preview screens. But it doesn't let you change everything. I can't change the Action 53 theme song that plays over the title screen or remove the "Make a selection NOW" voice that plays after it. They don't provide a way to do this.
There's a notice on the github page that says all of Action53 is royalty-free to use as long as the original author is credited somewhere, but the default theme and voice don't really fit. How do I change these things?
Also, the description paragraphs turn out double-spaced, even though they're single-spaced on the original Action53 cart. This isn't really a problem since my descriptions aren't that big, but I don't think it's supposed to be intentional.