Comment 7 for bug 163037

I'd start by drafting a spec on the wiki (see https://wiki.ubuntu.com/FeatureSpecifications), and registering it on Launchpad. To get it approved usually requires significant effort to identify how it might be implemented, but once it exists, you may be able to garner community support to help figure out a good model.

Note that the current implementation of the archive management software doesn't support hosting applications that aren't released, so once the spec was done, it may be held up for some time pending the resolution of infrastructural issues.