First off i recommend you go back to 0.8.0 because the NOS and Ghostmode don't work properly on 0.8.1.
ok in the race.zip file find the file race_server.lua, then search for this section
function launchRace()
table.each(g_Vehicles, setVehicleFrozen, false)
clientCall(g_Root, 'launchRace', g_MapOptions.duration, g_MapOptions.vehicleweapons)
if g_MapOptions.duration then
g_RaceEndTimer = setTimer(raceTimeout, g_MapOptions.duration, 1)
end
if getPlayerCount() >= (get('ghostmodethreshold') or 10) then
g_MapOptions.ghostmode = true
clientCall(g_Root, 'setGhostMode', true)
end
g_CurrentRaceMode:launch()
end
then you change this part "(get('ghostmodethreshold') or 10"
to 1, or how many people you want in the server till it activates.
then re-zip it and clear the cashe, restart the server and it should work.