We have talked about a Jenkins-style plugin manager where we might be able to add/remove plugins on the fly. Currently we're relying on the system package manager for RPMs and bundler otherwise, so it's a bit trickier.

This does hint at another looming issue, which is that some plugins should have an uninstallation/purge procedure which removes certain data from Foreman's database. As plugins get more advanced, it's likely that they leave things like STI data in tables or foreign keys that might interfere with running of the standalone Foreman app.