I did the manual installation myself, no problems. Its not about requesting a feature I would want, but making the automated installer well-behaved.
In my opinion it should behave like Linux distros do with GRUB nowadays, installing to MBR by default BUT giving you the choice to install to partition bootsector only if thats what you want to.
It could be presented to the user in a more friendly way, something like:
Choice:
A) Use Chameleon to multiboot all operating systems in your computer (Install to Hard Disk MBR).
B) Use another boot manager to multiboot (Install only to OS X partition).