Thanks for the concern and you input.
Version 3 is on hold as long as v2.4 is debugged and released. What we can offer right away is beta test of a version with page manager. (I will open separate thread for that, but I can share a link here too). On the link below you will find 90% functional version with page manager. Still there is no page manager button on the toolbar, because it's beta, but you can invoke it by pressing 'P' on the keyboard.