Option to restrict available application versions (e.g. WordPress 4.8.x only) via service plan settings (or subscription settings).

The use case is that we want to limit the options for the more inexperienced customer which represent the majority our customers. They have no need for a list of 15-20 versions to choose from, if they pick the "custom install" that is.

A secondary reason is the older versions are older versions for a reason. The older versions have unfixed security updates and optimizations. As a hosting provider you might want have the policy you only want installs of a certain version or higher.