The cadence step settings of 'Slowest" to "Fastest" are crude steps of RPMs and you usually only set this up once and then leave it on the level that suits you based on how tall you are, your natural leg power and riding style. But while riding you can use the controller to adjust the cadence in smaller steps but I hardly ever use this. And yes - you can adjust the power support settings on the App in the "Tune" setting to customize the Eco, Sport or Turbo modes to suit your style of riding. So have a play to get a feel for what suits you. Also - you can download the Enviolo app which connects directly to your IGH. It has its own settings where you can override some of the
Specialized setting for rpm. Specialized "Slowest" is 65rpm I think - but the Enviolo app setting can go down to 50rpm. It also has setting to customize the starting take off gear ratio. So - a lot of setting to play around with and it may take a while for you to get a feel for what works for you - or what settings you like for different rides. You can make it as complicated or as simple as you like!