For Floating Panes - see: https://github.com/lloydbond/tmux-floating-terminal/tree/mas... (if it doesn't work for you on first try - check - https://github.com/lloydbond/tmux-floating-terminal/pull/6)

Love Floating Panes in Tmux - and best part - all the other plugins - resurrect, continuum, etc..) all support floating panes out of the box.

This does have a single floating pane shortcut (in the current directory), using the tmux `display-popup` command.