Manga+Press 2.9.0 RC 2 has been released on Github for download and testing.
So far so good. I haven’t found any bugs in this current RC version. I’m at a point where I feel comfortable enough to release this version to the WordPress plugin repository possibly sometime this week.
I’m also at a point where I’m noticing other options can likely be removed, like the “Insert Navigation” functionality, which has been all but made obsolete by Manga+Press’ built-in template inclusion.