Thanks for the correction, I didn't read the docs carefully. Buildpack's a better idea than building stuff locally. This makes slightly steeper learning curve the only weakness of Heroku compared to Ep.io.
No problem. They don't actually talk about buildpacks all that much but I see it as the major differentiating feature on Heroku.
One thing you may be interested in is heroku-buildpack-multi[1] which lets you run multiple buildpacks. You could theoretically use this to include the standard Python and Node.js buildpacks plus a small custom one that just installs and runs Brunch.
