Sadly, I have found no way of disabling the movie button on the RX100. If there were a means of doing so, I would do it without hesitation.
The movie button is a total nuisance to those who have no desire (or only an occasional desire) to shoot video. A firmware update to provide disabling of the movie button, through a menu selection toggle, would be very welcome... Sony, are you listening?!
This is probably my only meaningful grumble about this camera.
Sadly, no. I'd love to see an option to reprogram it like the rear-wheel control buttons. Disabling would be a close second.
Seems like marketing departments pick out a button on every nice camera and decide that its function is Much Too Important to allow users to mess with it. At least a movie record button is nominally useful, unlike, say, Canon's direct-print button.