Originally Posted by TMF
I'd appreciate a plugin that allows easy merging of EPUB books into one, for creating omnibus editions or creating short story compilations. The discussion at this thread
contains a link to an Apache-licensed Python script that could be used as a basis for this.
It's on my 'wishlist' of things to do.
I wrote the epubmerge.py referred to, and I've since written a plugin. So odds are I'll get to it someday--if somebody else doesn't do it first.