It would certainly help having all distro quirks and dependencies dealth with.
Having a very easy built process will help making more people use gdc and help avoiding people like me :p
Once you have a package it's easy enough to `apt-get source`/download srpm,dsimcha wrote:
replace the code and rebuild producing new packages. rpm/apt-get makes sure
you got all the dependencies and someone else has already tuned all the
paths and any quirks for the distro. Unless there is a significant change to
the build it would simplify things for anyone who struggles to build gdc
(that doesn't require gdc in gcc though, just that there is a package).