i tried getting rid of my vista boot manager after installing chameleon, it didn't work! easybcd was moaning about changed partition setup and the attempt to repair always failed.
so i'm sorry pal, i found no way in altering the vista boot manager after having chameleon installed.
i ended up installing leopard to a different hard drive and now having vista and leopard on two hard drives. this makes the whole booting thing painless!
the only solution i could think of is follwing these steps:
http://neosmart.net/wiki/display/EBCD/Reco...er+from+the+DVDlook for
Step Three: Manually Repairing the Vista Bootloader
after that you should be able to remove the bootloader from vista and then reinstall chameleon again!