Gnome SuperUser (gnomesu) is realy just xsu, but changed some to fit Gnome2 more. It opens a dialog where you can type in what application you want to run as root. It could be included in app-admin/xsu2. But since the developers named it differently maybe it should be app-admin/gnomesu.
Created attachment 7625 [details] gnomesu-0.2.99.ebuild
*** Bug 18862 has been marked as a duplicate of this bug. ***
I'm the gnomesu devel - 0.2.99 is not the most recent version, and I'm going to be doing a new release in a few days so you might want to use that. Also xsu is no longer being maintained - gnomesu uses the same codebase but behaves a bit differently. It's up to you guys if you want to replace it.
Probably gonna be gnomesu then, but it will most likely be after the next (rc) release before we get around to it.
i've added gnomesu-0.3.1 to portage.