I hear ya...I do not like adding gizmos either, it makes no sense why engaging this button at idle cuts off the engine. I am certain it is confined to our Blaster wiring or all Blasters would do this.
Maybe I should snap a pic of what I did...it is not a piece that could ever come loose or rattle around, basically permanent and we rode it all day yesterday without any issues. I have instructed my son to simply pull in the clutch if anything happens and he has been clutch riding for awhile now. Honestly I feel better about this rig than cutting/splicing wires. Also, the throttle is clean, lubed, and functions smoother than some of our other bikes---no binding whatsoever.
Funny you mention...I got into playing on used bikes to show my son a few things...I end up being the primary guy out there sweating in the garage and never notice him disappearing from view when "we" are working together.