[Tactical Fart]

It's a java program. I don't think there's a work around. I can post the method that I use if you want though.

Can I get a sample opf that ebook-convert will take? I found the ones in the epubs I've made thus far. If I specify an opf, does ebook-convert make it's own based on the one specified or does the one specified receive total priority? Also how do I pass the opf to ebook-convert? Or did you mean ebook-meta?

Edit:
I found a work around. I used an opf that I extracted from an epub that ebook-convert made, striped it down so that it is very basic, manually replaced a few fields, then used ebook-meta. It only replaced the metadata that was specified in the opf. I'll just have my program construct a basic opf, and then call ebook-meta when the ebook is made. Thanks again for your help, and for this ridiculously powerful program.