I don't know if this will help, but you can probably use a Windows-configurable bootloader like GAG
. Note that you should make sure that whatever you use won't cause you problems (see MozillaQuest article on Symantec's BootMagic here
Ayway, the point is that I don't think* you have to use the default bootloader from your distro.
*but I could be wrong...
Note that my suggestion of GAG was only because it was the first thing I came across. I have never used it. You can check out SourceForge
for more opensource projects (i.e., bootloaders) that may be of use.