While keeping it to a CD has been nice through the years, I don't see how we can continue to do so. If we start robbing Peter to pay Paul, it's time to rethink the medium. Yes, "Light" can be kept to one CD, but I think we're limiting what we can do if we keep to the "One CD" mindset.
As for the installer.
Allow me to pick and choose boot menu items in Grub. In other words, I NEVER share the same drive with Windows and Linux. Therefore, I'd love to be able to tell the setup to ignore Windows for the Grub menu creation.
Along the same vein, allow the inclusion of boot parameters. On my old notebook, I had to set rootdelay during boot or I'd run into a kernel panic. Being able to set that during the installation would have been a godsend.
Now... Here's the really challenging bit. For an old hat like me that's been involved with computers since the late 70's, partitions don't bother me in the least. However, gparted can be a real nightmare for the noob who's dealt with nothing more than point and click and would immediately go catatonic if they had to work at the CLI. Perhaps we'd get more folks trying things out if the installer could see what's on the system and then make a recommendation as to what the best setup would be for the user?