[Idea] Way to quick switch between two custom white balances (for filming)

[kitor]

Hey,

A few days ago I was recording local event with my 550d (monument unveiling, concert, some interview, everything just before and after sunset). Because of lights on stage I needed much different WB than when looking on audience, etc. My idea is to have option for two custom defined (in K) white balances that user can quickly switch between with some keypress. There's (for example) this DOF preview button that is useless when in LV, so it could be potential place for this function.