Hey Slo,
A cruise sounds nice, but I am very pleased with my Throttlemeister -
Clicky here.
Easy to use as a throttle lock, it can also can be used as a "sticky thottle" that lets you ride without needing to twist your wrist against the return spring, but still control the throttle instantly.
Very well made, with good customer support, it looks nice too, even though they don'y make it in black. I am modifying the wifey's Adventurer bars to accept one.
Brooke