xbindkeys
$ cat ~/.xbindkeysrc.scm ; bind shift + vertical scroll to horizontal scroll events (xbindkey '(shift "b:4") "xte 'mouseclick 6'") (xbindkey '(shift "b:5") "xte 'mouseclick 7'")
$ cat ~/.xbindkeysrc.scm ; bind shift + vertical scroll to horizontal scroll events (xbindkey '(shift "b:4") "xte 'mouseclick 6'") (xbindkey '(shift "b:5") "xte 'mouseclick 7'")