As it happens regular-rc testing has shown that cinnamon,
gnome3 and kde4 flavours included NM via their pkglists
and dependencies (which used to result in live feature
enabling NetworkManager service wholesale when found);
now when handling default services has become more strict
it became apparent that these images have got their LiveCD
mode running without network by default (installation does
set that up though).

It looks like an easy way to just stick +nm into .regular-desktop
dependencies but then razorqt, sugar, xmonad would get NM which
is not what they're gonna handle; e17/e18 too.