I get the reasons here for not going through the hassle of incorporating a full-on ePub viewer within Bookends. But, much to my consternation,

In my own haphazard workflow with ePubs, Calibre ends up being huge and slow, Apple's Books is mostly useful for light reading, Kindle can be necessary because it syncs ePubs and audiobooks well, and Clearview X at least makes a valid attempt at letting the user organize files. This means I have a bunch of ePub apps lying around.
Which brings me to my question:
That's not always the same as the viewer I want as the system default. I've found the similar setting for the PDF viewer incredibly helpful, so having one for ePub viewers would be great.would it be possible to have in the Bookends Preferences a selector for the "default ePub viewer" to open files with?
Peace out,
Todd