Originally Posted by
Campag4life
Thanks Noodle Soup.
Will it try to shift with the crank not spinning? Will the servo's push on the derailleur hardware? Any idea?
Refrain from doing it. Shimano says so in their user manuals. Yes, it will try to shift.
"Note • Be sure to rotate the crank when carrying out any switch operations which are related to gear shifting."
http://si.shimano.com/pdfs/um/UM-5ND0B-004-00-ENG.pdf
Also...in addition to any concerns of bending derailleur mountings....incomplete shifts will keep Di2 awake and eat your battery.