I agree with a lot of the suggestions but there are a few that are a bit off-base:
Cooker is very bleeding edge, for eg. they're just now starting to put up 2.6.17 kernel RPMs only a few days after they've been released. Cooker will always be a developers plaything and will always be a unstable and buggy because of that.
Actually Gimp and Inkscape are under Multimedia->Graphics which seems pretty consistent to me. Or do you think we should have a Graphics menu at the top level?
It already does this in the installation AFAICT. That said the firewall UI needs a lot of work - its very basic and primitive.
and..
No offence but you guys are way off here. Mandriva has used udev/hal/fstab-sync/gnome-volume-manager for automounting CD/DVDs and USB devices for a long time now, since at least 10.2 and I think even before that. Supermount has been deprecated to floppy devices only since floppy devices don't provide notifications when media is inserted so the udev/hal/fstab-sync/gnome-volume-manager stuff won't work with them.
I've compiled several vanilla-kernels fine without any patching and CD/DVD and USB automounting and unmounting works perfectly without any fiddling required. I'm guessing your problems came about because you tried to use supermount in your vanilla-kernel for everything, not realising that Mandriva doesn't actually use it except for floppy drives.
The stated reason for not using autofs instead of supermount for floppys is that it continuosly polls the floppy looking for inserted media, meaning the floppy light flashes all the time.
Club membership gives you access to Powerpack CDs/DVDs with commercial applications on them, as well as things like Mandriva Kiosk with upgraded packages for things like KDE, GNOME, OO.org and Firefox. The development process (Cooker) is open to all.
This is a user setting in the KDE control centre, if you want it then set it yourself. The majority of people are used to double-click so that's the default.
I've recently decided to go back on the Cooker list to try and help with 2007 development. Hopefully I can get some of the issues like you guys have suggested fixed or improved.