I'm using kdebase-workspace 4.4.0-3.fc12 from kde-testing on fedora 12. "Leave..." does not show up in the classic style Application Launcher Menu, although it is selected in the the Application Launcher Menu Settings. This worked properly with kde 4.3.4 .
Looks like a missing hunk in my classicmenu-logout patch (somehow it wasn't ported properly), I'll investigate.
Should be fixed in kdebase-workspace-4.4.0-5.fc1[123] (it was indeed a hunk in my patch which went missing), we'll make sure to include that in the 4.4.0 update set.