Yes it is. I very much miss the old Logitech three-button mouse (which had equal-width buttons, not a clickable scroll wheel)

Yes.

Nah, unfocused window scroll is the killer feature

I 'm actually super frustrated with copy/paste in "mixed" environments (ie. PuTTy on Windows logging into linux and running terminals via tmux).

I know deep in my soul that Microsoft has to be the source of the incompatibility, but ctrl-C/ctrl-V works *everywhere* in windows, but copy/paste in linux has the myriad of Xterm/TTY/tiling window manager conflicts that need to be juggled and configured to work properly.

At least when accessing a remote terminal using PuTTy or often even a VNC client.

/rant