I don't know if there is a specific cap value, but I'm willing to bet that it lengthens the response time from stop to full throttle even if you hammer it to prevent the current from spiking high. If this is true, it seems to me that this setting and the throttle response setting are very similar. Maybe the throttle setting adjusts the timing instead, I dunno. I guess the best thing would be to contact them in person. The number is on the last page of the manual IIRC.