@darwin Have you guys considered making a complete finder replacement? Something like Path Finder, but with the features and look of TotalFinder. If you do end up making something like that to work around the issues in 10.11, I would definitely buy a copy, even if it costs more than TotalFinder currently does. Maybe you could call it TotalFinder Pro
If you do end up making something like that, you might consider opening up pre-orders to support development while you work on it. I would definitely be one of the first people to pre-order it, even though I'm on 10.10.3 and can still use the original TotalFinder.
While I'm sure it would be a lot of work to turn TotalFinder into a complete finder replacement, I think it would open up a ton of possibilities that can only be done with complete control over the app. One of the features you might be able to add would be faster file copying, like TeraCopy on Windows but built-in. Maybe it would also make it possible to get rid of that annoying issue I keep getting where sometimes TotalFinder restores the session with every tab going all the way back to the root on the left (in column mode) instead of whatever sidebar item I started with.
Anyway, if you make a complete finder replacement, I would definitely support it.