No, there's no way to adjust the switch. It is what it is.
However, you can use EXP 1 or 2 to control whatever you want. You can use EXP 1 to control volume and wah. Or you can use EXP 2.
You can use snapshots to turn things on/off: in one snapshot, wah is on and volume is off; while in another snapshot wah is off, volume is on. You can also use percentage-based bypass for volume or wah, or any other effect.
I hate that toe switch! I hate that I have to really step on the expression pedal and have Helix lift up on one side--that's how hard it needs to be pressed! On my Helix, I only use EXP 2, and never EXP 1. If I need a wah in my solo, I have a snapshot called "Wah Solo". When I engage that snapshot, the wah is already enabled. When I'm done playing the wah solo, I go to my "rhythm" snapshot, where the wah is disabled.
Or if the wah constantly needs to be turned on/off, I set it up by percentage: over 5 percent it turns on and less than 5 percent turns off after 500 ms, or whatever value makes sense for the song I'm playing.
I have a little video you may find useful.