What you're describing doesn't make very much sense. There are only two cases here:
1) A feature that's in develop may sometimes need to wait for something (QA, business validation, a go-ahead, whatever) to go to master, or
2) A feature that's in develop can ALWAYS go to master at any time.
In the first case, you can have feature X blocking all other features because it's in the same branch as them, which is the problem the GP is describing. In the second case, the two branches are the same, so why not just merge into master directly?
