Multi-colored aux lights are a relatively new introduction to flashlights. Emisar D4v2 uses RGB aux LEDs which provides 7 possible colors.
I propose that they can be used to provide more intuitive advanced configuration, which does not require the user to count buzzes or perform rapid clicks, and which provides immediate visual feedback on current status of each option.
For example:
User performs long hold (5-10s) to enter config mode
1. Light performs a short buzz - the color of which informs user of current setting function.
2. It then performs a long blink (1s) - the color of which informs the user of current value within this function.
(Repeat 1 & 2 until user advances to next setting function)
Within each setting function, a single click cycles through the possible values (in a continuous loop) - user receives immediate visual feedback via a change in the long blink color.
A double click advances to the next setting function (in a continous loop). We know we are in the next setting function because buzz color changes.
A long click exits configuration
With 7 colors we can do 7 setting functions, and 7 values within each function.
If we want more possibilities, we can of course easily combine colors (eg buzz red,green)
I use NarsilM as a basis, purely for illustrative purposes as many are familiar.