This could be really good, so that I wouldn't have to keep the nob of my baseball bat on the W key for ten minutes while traveling 150 kms. These could work by using a logic clock to repeatedly fire the engines, just like using weapons computers.
You can already go 150 KM/hr (It's really m/s, dunno why it says km/hr.If you want to travel 150 km you should wait until FTL gets implemented. A cruise control and/or autopilot would be nice though.