Make Nightly use a different profile directory?

Hi, The Firefox Developer Tools team (and I'm sure many other teams working on Desktop Firefox) would really love if Nightly adoption rate was increased. One way to achieve that is to follow what Chrome did with Canary and allow running Nightly simultaneously with other instances of Firefox without manually creating and choosing profiles. AFAIK, right now all channels use the same Application Support/Firefox directory (on my Mac at least) so my proposal is to change that to FirefoxNightly. The main benefit, as I see it, is allowing web devs to use Nightly alongside their normal Firefox without too much trouble (it is a pain to run Firefox with -p on a Mac without additional tools). Thoughts? Anton