A logical next step would be to add bounty on specific bugs or features requests.

If a company is relying on open source, and has no capability to fix a critical bug (which is a bad strategy but it certainly happens), it would probably be ready to pay a hefty sum so that the maintainer, or anyone involved in the project, will have at least a look at it.

Today, unless you can contact directly the maintainer and hope he or she has some spare time, I don't know how you can solve that kind of issue.

However, I am not sure who will decide a bug is fixed or a feature properly implemented.