Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

"the potential is there for example to specify a certain wattage level and then have the bike automatically shift to maintain that wattage. Such a scenario would be of significant use to time-trialists as well as triathletes who tend to maintain specific effort levels for sustained periods of time"

http://www.dcrainmaker.com/2014/04/garmin-edge-1000.html

Doesnt sound like rocket science to tell the unit 'I like 85rpm cadence', and have it shift for you. For the best gir and chainline for a given wattage. Allowing you to adjust target wattage on the fly.

Preferably via something that makes a broom broom noise.

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