About this: refreshing the package list takes a while more often than not, and now it is triggered everytime you disable/enable any single repo. Would it be possible to implement some sort of batch repo-managing process, with the refresh triggering only at the end of it?

I don't know, the first thing that comes to my mind is a separate "Manage Repos" page (in the Profile pulley menu for example) where I can plan all my edits, and then only when I "Accept" with a slide to the left the edits are actually applied and the refresh takes place?