yes it is fine to only press the button for just a sec or less, just be sure that you are at full throttle.
many great bracket racers have nitrous just to press for a half a second or so just to make up a hundreth of a second or 2 if they spin the tires
ps 1st gear is wear most of the et gain in nitrous comes from provided you can do so with out excessive wheelspin, having it on a button gives you more control and you can be on and off the nitrous multiple times example in first gear press the button tires spin lift off the button but stay full throttle then when traction comes back go back to the nitrous.
many great bracket racers have nitrous just to press for a half a second or so just to make up a hundreth of a second or 2 if they spin the tires
ps 1st gear is wear most of the et gain in nitrous comes from provided you can do so with out excessive wheelspin, having it on a button gives you more control and you can be on and off the nitrous multiple times example in first gear press the button tires spin lift off the button but stay full throttle then when traction comes back go back to the nitrous.
