Boost Controlled by Throttle
This setting is a limit for the boost timing addition, in relation to the throttle position, which can aid car stability whilst on throttle. If enabled, the ESC will monitor the throttle position and Motor RPM, and limit the maximum amount of available boost timing.

E.g. If the boost timing is set to 36 points and the boost end RPM setting has been achieved, but the throttle position is only 50%, then only 32 points (50% of 64 points) of boost will be applied.