Btw: on github I found this explanation from BotoX:
"Lever virtual limit: you can make it do 100% current earlier
Like normal the max current is at about 2/3 of the lever pressed, you can make the range smaller with the limit"
I think it means that the Lever virtual limit setting does shift the end point, where 100% brake power is reached. A lower value results in a shorter gap between the "kick in" point (which is given by the sensor) and the end point. With the default setting (115) the end point is about 2/3 of the lever pressed.