V2.2 has been released, get it from GitHub or the files section.

I think this is it; I've been running the tank for several months and using it myself, getting feedback from the staff at the shop, etc.. And I just committed a final few changes based on that.

I have one (self pedantic) change I want to make, to make the optional hardware easier to configure and more consistent in how you do it. So a there may be a v2.3, but I do not currently plan on doing any further work on the functionality.