ok, for all: put this in autoexec:
// speed knife script
//remember to replease "m" with any key you want.
set sl_00 "set sl_f vstr sl_01; ut_echo ^4Human; vstr zom"
set sl_01 "set sl_f vstr sl_00; ut_echo ^1Zombie; vstr hum"
set sl_f "vstr sl_01" // Set Default
bind m "vstr sl_f" // Replace "m" with a key of choice
set zom "bind MOUSE1 +attack"
set hum "bind MOUSE1 vstr att"
set att "+attack; -attack; wait 3; +attack; -attack; +attack; -attack; wait 3; +attack; -attack; +attack; -attack; wait 3; +attack; -attack; +attack; -attack; wait 3,5; +attack -attack; +attack; -attack; wait 3; +attack; -attack; +attack; -attack; +attack; -attack; wait 3; +attack; -attack; +attack; -attack; +attack; -attack; wait 3; +attack; -attack; +attack; -attack; +attack; -attack; wait 3; +attack; -attack; +attack; -attack; +attack; -attack; wait 3; +attack; -attack; +attack; -attack; +attack; -attack; wait 3; +attack; -attack; +attack; -attack; +attack; -attack; wait 3; +attack; -attack; +attack; -attack; +attack; -attack; wait 3; +attack; -attack; +attack; -attack;
+attack; -attack; wait 3; +attack; -attack; +attack; -attack;
+attack; -attack; wait 3; +attack; -attack; +attack; -attack;
+attack; -attack; wait 3; +attack; -attack; +attack; -attack;
+attack; -attack; wait 3; +attack; -attack; +attack; -attack;
+attack; -attack; wait 3; +attack; -attack; +attack; -attack;
+attack; -attack; wait 3; +attack; -attack; +attack; -attack;
+attack; -attack; wait 3; +attack; -attack; +attack; -attack;
+attack; -attack; wait 3; +attack; -attack; +attack; -attack;
+attack; -attack; wait 3; +attack; -attack; +attack; -attack"