It is easy to change the scroll speed in tmux, although the default is 5 lines at a time which seems like it should be fast enough...
Mouse and scrollback and clipboard are some of the more complicated areas of terminal emulators and ones where applications like tmux have the least power so they will always have the potential to be a bit fiddly.
Mouse and scrollback and clipboard are some of the more complicated areas of terminal emulators and ones where applications like tmux have the least power so they will always have the potential to be a bit fiddly.