

I’ve tried quite a few distros (openSUSE, Ubuntu, Solus, Arch, so on) and none seem to offer this feature. It’s a shame, as it’s quite useful to have since updating a live system can sometimes cause some trouble. Even just the updating from Discover can be broken on some systems (I know openSUSE at the very least acts a bit funny when it comes to PackageKit, I think Arch as well).
It is a KDE thing, but Fedora is the distro on which it works best. On a lot of other distros it often runs into problems.