Vehem and xienwolf have expressed an interest in making our own scenarios at some point. But that's not in the works at present. Currently, we're working on <insert secret stuff here>
And also <more secret stuff I'm not telling>
I'd personally like to see the FFH scenarios playable under the FF engine. It's a lot of work for relatively little gain in the eyes of some though, so it's not something we're ever likely to do. But as far as I understand, the scenarios consist mostly of a custom made map, various custom events, and generous doses of Python. With odalrick's fancy modular python, it might actually be possible to make a module for that - which edits the FFH scenarios to make them compatible and balanced with FF