set  cf.+button8    "-speed; +button8"
set  cf.-button8    "        -button8"

set  cf.+forward    "vstr cf.+button8; +forward"
set  cf.-forward    "                  -forward"

set  cf.+speed      "vstr cf.-button8; +speed; set cf.speed vstr cf.-speed"
set  cf.-speed      "vstr cf.+button8; -speed; set cf.speed vstr cf.+speed"
set  cf.speed       "vstr cf.+speed"

bind W      "+vstr cf.+forward cf.-forward"
bind SHIFT  "vstr cf.speed"
bind CTRL   "+vstr cf.+speed cf.-speed"