That’s the best I’ve seen. It would also affect rolling resistance (which is modeled the same as slope) but the name is sufficiently descriptive.
I agree, the difficulty setting don’t follow the profile. My experience is based on the device running zwift. My wife and I have completely different setups but I decided to use her computer and the trainer difficulty didn’t follow me to her computer. The setting should follow the user not be based on the device or the trainer.