1) Yes. As a regular product. We have a few 1680W motors left, and cobble together one or three if a customer really wants one.
2) Yes
3) Yes hold throttle at a fixed speed. The 3-position switch is for 80% , 100%, 120% speed, you can only set the 120% with load, the 80% and 100% can set with no load.
The horn is cruise control (yeah I know), when you turn the throttle and you press the horn the motor RPM will fix at that point, when you press again it will cancel the cruise control.