20-min FTP test with 'slope mode' or 'ERG mode'

When performing the 20-min FTP test, the 20-min block does not enable ERG mode and you have them modify your power by shifting. In my case at my usual cadance, it was either 320 watts or 370 watts. To get at my typical FTP, I had to modify my cadence too much from my preferred cadance.

To enable you to easier obtain a specific output at preferred cadance, a solution would be to allow ERG-mode in the 20 min block, and let the user increase/or decrease the power by playing with the % (standard at 100%). This is for example already possible on standard interval sessions, but unfortunately not feasible on the 20-min block of the FTP test.

Another option, probably more in the spirit why ERG-mode was removed, is to enable slope mode and let the user increase or decrease the slope to achieve his desired power output at preferred cadence. This approach is for example possible in trainerday.