Only way to transfer .kfx files ==> Paperwhite is from calibre?

Just checking.

KFX is the superior format but it is a bit annoying to plug into the USB port each time I want a book. Just was curious if there was an easier way on both stock and rooted kindles.

I guess on a rooted reader, KOReader might be able to support epubs better than my stock Kindle does (not at all).

Any chance of a 5.8.X root for the PW2?

Grab bag of questions :)