Cuzjohn:

ANSI/ITSDF B56.1-2005, Safety Standard for Low Lift and High Lift Trucks, does not require a key switch shut-off device.

"A manually operated switch (may be key type) to disconnect all control circuits shall be provided."

7.19 Travel Controls: Electric Trucks, Sit-Down Rider (7.19.3)
7.20 Travel Controls: Electric Trucks, Stand-Up Rider (7.20.3)
7.21 Travel Controls: Internal Combustion-Powered Industrial Trucks, Sit-Down Rider (7.21.3)
7.22 Travel Controls: Internal Combustion-Powered Industrial Trucks, Stand-Up Rider (7.22.3)
7.24 Controls: High Lift Operator-Up Trucks (7.24.5)

"Means readily accessible to the operator shall be provided to shut off all power to the truck."

7.23 Travel Controls: Electric Motorized Hand, Hand/Rider, and Low Lift Order Picker Trucks (7.23.7).