I wouldn't do that; it's not necessary.
You only need one boot-loader on any given stick/drive/whatever. Invariably, this is always the first partition (actually, immediately in front of it - that's where the Master Boot Record lies).....and it's this partition, with the boot-loader, that needs to have its boot 'flag' set.
For any other partitions, on the same, physical device, there's no need.....unless you plan on 'chain-loading' a second or third boot-loader from the first. Multiple boot-loaders simply make things very confusing, for everyone/thing concerned (especially your hardware).
Why would you want a boot-loader for each partition?
Mike.
