Going forward, we will continue to make improvements to the current software. One of the most requested features is improving the forum's usability on mobile devices, and that is already being worked on.
Donate a good amount of money to the SMF team, ask them the improvements you have in mind, ask them to assign a dedicated team for our version of SMF. I don't think you will require even a $100k investment.
It's good to know that you finally decided to break the loop.
Why spend more Bitcoin on third-party developers when we already have our own wizard, PowerGlove, doing everything for free? If anyone needed to be paid to enhance the forum, it would be him. He made significant patches for free; imagine what he'd do if paid.
Make the forum mobile friendly and maybe some changes in DT voting system that's all.