You should consider crowdfunding development of this add-on if it would create an opportunity for you to work on it further. I have a gaming guild with members who would throw in some money to ensure this add-on remains compatible with future versions of XenForo, especially if additional features are added. I've considered donating, but without the promise of future development it hasn't seemed wise. If not crowdfunding, charge for it so you're properly motivated to keep it going - it doesn't look like I'm the only one who feels it would be worth purchasing. It's revolutionized how our guild manages its TS3 server and we'd feel like we're stepping back into the stone age if we ever lost it.