When using a regular exp pedal without a switch,
In Helix, there’s an automatic on/off setting so when you have the pedal in full heel position, you can choose how long it takes to turn off automatically (in milliseconds) and turn on as soon as you rock the pedal.
Is there an option in the QC like this?
Yes.
See the “Expression Bypass” section of the manual for more info.
I think the factory preset Rage Against the Machine has this feature, you can see how it’s implemented.
I’m using this function for pitch shifter function. So, I’m sure it’s possible also for wah. 
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This feature is already implemented per all previous responses - I’ll be locking it
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