I believe it would be useful to have some kind of override in workouts that set a certain cadence for efforts, much like you have the bias adjustment in case you find the set power too much towards the end of a workout.
I was just doing a workout that set a low cadence during a high power effort. I’ve had previous knee problems and try to avoid these, but if I continue at a high cadence for my comfort I get the ‘SPIN SLOWER’ warning and don’t get the gold star for the segment. I felt a twinge in my knee and knew straightaway it wasn’t something I could just ride off and decided to stop. Had I been able to continue at my regular higher cadence I’m sure I would have been fine.
Given that Zwift is great for those recovering from injury I think this would be a great additional feature, especially as it’s not always obvious in the workout description that there are going to be set cadences, so if you suddenly encounter this part way through a workout it would still be possible to continue without risking further issues. As with the bias adjustment, it’s much better to tweak this and be able to finish a workout than have to give up altogether.