I work for nodejitsu.
Firstly, I believe that your problem can be solved with bundledDependencies in your package.json, for example:
{ "bundledDependencies": [ "myModule", "myFork" ] }
Then, when jitsu associates your deployment application (which uses npm), it will also associate your dependency with it.
If the package is in the projectβs personal fork on github, npm can also be directly fetched from the git url. Check out http://npmjs.org/doc/ for more information on how to extract npm modules from non-registry sources.
Also: we have a special support group that you can contact either via support@nodejitsu.com or in #nodejitsu on irc.freenode.net.
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