2Wheeltips

Every rider should know about crampbusters and throttle rockers. They are plastic "paddles" you wrap around your throttle. You rest the heel of your hand on the paddle and it keeps the gas open. Sorta like a poor man's cruise control. 
 

You can get the permanent metal ones that are more stylish,  but the originals work great and are very affordable.

So, if you don't have a few hundred dollars to give your dealer for electronic cruise control, throttle rockers and crampbusters are the ticket.