I just could not stand the mouse behavior, ultimately. Switched to screen for some things. Sometimes its just easier to use the trackpad to scroll than page up/down or select text with the cursor vs. with the keyboard. Can't do both in tmux; either you can scroll in programs and not in the shell, or loose 'modern' copy paste and select behavior with the mouse as well as scrolling in programs to get scrolling in the shell. I just couldn't figure out how to have it both ways like the native shell.