Matthew Paul Thomas from Canonical design team is working on a new GUI that will make it easier to configure GRUB2.
A new “Startup” panel will be included in The “System” category of System Settings. Check out some mockups from wiki page:
Over the past couple of weeks, I have designed a GUI for basic configuration of Grub2.
The idea is to provide, in the default Ubuntu installation, a UI for the options that people configure most often -- so that you don't need to dig into grub.cfg or /etc/grub.d/ at a terminal. It's not meant to be a replacement for a complex tool like Boot-Repair.
Ubuntu 12.10 is beyond feature freeze so it may not land in this cycle. More information can be found in the discussion here.