Customise setting in App

Hi, in the Evolve app there is the "Customise setting", the help menu says "it increases torque and acceleration". There appears to be just a single dial or is there more to it than that. ? I aussme you can't independantly control torque and acceleration ?

I assume what it does is let you create a customsetting somewhere inbetween ECO and PRO and that's it? Has anyone found it useful at all?

thanks