The game has that ability, but it is not exposed in the user interface yet. One of the developers said they want to add controls so you can change the game speed.
If you host a custom server you can do this with command line. :3 @raevn and @cola_colin should know the commands iirc?
tried it, did not work page up was turning off the headligths on my commander for some reason have the keys been reassigned? edit: to specify, i tried running server.exe, and then running the game