Crunching through the numbers of the gear ratios I had a little epiphany this morning.
If every time I shift a chain ring, I do a simultaneous and opposite shift on the rear cog (double shifting?). That applies to either up or down shifting. That way the change in the cadence will be much smoother and not as abrupt.
Trying it out on my ride this morning, the shifting worked flawlessly.
This seems so simple and intuitive, it made me wonder if everyone is already doing it and I am just a little bit slow. Or are most people not bothered by the change in cadence and I am making a big deal over a non-issue?
On another note, can the DI2 system be programmed for this? It would be ideal if the buttons on either hand can be programmed to shift up and down and not linked to the individual derailleur. Can the gear choices and double shifting be made by the computer? Or does this still require a software hack at this point? It seems to me that this is an easily programmable advantage of the electronic system over the traditional mechanical system.