ESP32, TMC2209, and UART Control of Microstepping

I think I'm misunderstanding something here.

The TMCStepper Library (by teemutatlut) initializes a driver via:

TMC2209Stepper driver(&SERIAL_PORT_2, R_SENSE, DRIVER_ADDRESS_1);  
// Creates TMC driver

And there is no command that I can see that lets me set something like:

driver.setSpeed
//or
driver.runSpeed;

Which are commands that the drivers in MobaTools and AccelStepper seem to have..and I don't believe I can use MobaTools or AccelSteppel to initalize the same driver at the same time, to run those commands.

The code in #38 shows that the dir and step pins are initialized, as far as I can tell. I am struggling to find a correlation between the datasheet's explanations and the commands in the TMC2209 library, though.