The one problem I have with both Xfce and LXDE is they don't ship with an
easy way to edit the menus. It's pretty minor, though.
Honestly, I think an Xfce edition, would be a perfectly good idea. It's
similar to LXDE, sure, but they're not exactly the same. In particular, I
personally think the way Xfce is configured is a lot more intuitive and
novice-friendly than the way LXDE is configured.
Has GNOME Shell gotten more configuration options? The only two things that I
particularly didn't like about it was having to drag the mouse all the way
across the screen (because the menu takes up the whole screen), which is
incredibly tedious, and that the menu opens and closes instantly whenever you
happen to move the mouse to the top-left corner.