i think theres sth called a wah pad which does that. its an extra pad u connect to the wah and you dont need to step on the on/off switch to activate. if i remember correctly its by g-labs.
Voodoo Labs has the Wahzoo as well.
Why don't you want a Morley? My Pro Series II has served me for years, and before that, my ex-teacher for years as well..