Sounds like your dad, maybe. But it was my first thought too. Jamba does a lot of this. Others like "group hearth" are a simple macro and require a keypress to do anyway AFAIK. But you do have an impressive (planned) feature list. If I was less tired, I would sort them against the Jamba list for new ones, then flag the ones that interest me.

I'm also curious whether it would be difficult to implement many of these as Jamba modules, since Jamba is designed modularly to begin with (and rightly so). Alternatively, if you plan to implement them in a way that lets them be installed individually instead of monolithically. While you may enjoy coding them as an end to itself, I would only be motivated to install parts that work better or do something new compared to what I've already got - the curse of the second guy to market, yes?