Centralized Grub2 wanted

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http://forums.fedoraforum.org – For every operating system on my computer, I have two installations. One version I call prestine,and the other my play version. I have Fedora 18 x 2 Fedora 19 x 2 Mint14 x 1 Windows x 1 My default is to boot from one of the fedora 18 versions because it is on a disk that happens to allow os-prober (grub2-mkconfig) to recognize all the installed versions, and to generate an accurage grub.cfg If I boot from any Fedora 19 disk, os-prober/grub2 miss some of the installed operating systems, and yes, I generated a fedora bug report about this problem. What I would like is a centr (HowTos)