You assume wrong. I've been designing that since 2011, touchpad and 2 buttons.
Put it in ripup mode (ripup icon on the left, or right-click on the trace and left-click ripup).Ripup as many trace sections as needed (leftclicking). Ctrl+z can be used to undo wrong moves.
Time to put a proper full-size 7-button wireless mouse on your Christmas list then.Assuming now you still believe in the dude ofcourse.Leo..