I just heard back from George at Volt bikes and he says the Mariner special edition does have throttle only mode , maybe this is a new feature on the 500watt special edition thats just now coming out. I really like the ability to just barely touch the throttle at a complete stand still to get the bike going without pedaling then kicking in PAS. George has been great at answering a ton of question, which is rare these days. I am feeling much more secure about my purchase now. Still bummed that there is no way to disengage the governor limiter 20mph engine shut off, but George at Volt assures me that 20 MPH on a 20" fat bike feels really fast.
I did try a Rad Mini and PAS level 1 barely did anything, PAS level 2 kick in quite a bit more but level 3 was like way too much. on the flats it was like once I got going level 2 wasn't enough but level 3 was way too much and aggressive.Made riding on anything fairly level seem very jerky going from PAS levels 2 and 3.