I installed a AUDIOVOX automotive cruise control in my STROM. It is a genuine cruise control with all the features of the cruise in your car. Not too bad to install, and it works great! I live out in the prairies, and I spend a lot of hours on the highway, I don't know what I'd do without it.
I used to use throttle locks, but I don't like them. I worry too much about emergency stopping, a throttle lock might not get shut off in time. The cruise control shuts off electronically as soon as you touch either brake.
The Audiovox unit installs in about 4-5 hours, and costs about $100. Not too difficult to install, you need some basic skills and some basic tools. If you decide to install one, email me and I can give you some shortcuts. If I did mine over again it would go much faster and easier.