On Sat, 21 May 2016 10:22:50 -0700 (PDT), trader_4
wrote:

Sounds to me like he doesn't want to stop anything. His annoyance is
the opposite, if he doesn't disengage the blades, when he tries to
back up, the engine shuts off.

Then don't back up. My take is the OP is annoyed by having to do so.

The things we suffer through life. Most lawn cutting tools I know of
work in both directions.