I should have just consulted the source to begin with. I could provide my own posix implementation of gettimeofday as that is the fallback for when the OS isn't windows, mac, or Linux. But then you are forced into using extremely large variables.
Perhaps another os definition like, roll your own, could let you override the Nim proc getTicks() with whatever you wanted it to be. Including build options that allow the Nim runtime to be customized only in user code would be a great feature. I think you could modify the system files yourself if you needed to.
