Q: Will this work with UI.X themes or other themes that use a 'framework' like those from PixelExit?
A: No. Those themes have their own custom footer management and you should use those tools for changing your footer. This add-on is meant for theme that are using the stock footer template.
Q: Can you add a new option?
A: Maybe. Let us know what you have in mind.
Q: Why does your demo screen shot not show the XF copyright?
A: We use branding free XF on our sites. The XF copyright will appear at the bottom of page like normal.
Q: What about the
A: It will display as normal at the bottom. If you do have a branding free license and modify the
extra_copyright phrase then just the extra copyright value will show (which is the normal behavior of XF).