Your best bet with the ring you have there is probably:
a) turn the UV down as low as it'll go and set the brightness lock (if you don't mind having the warm white's locked at a certain output level) and/or
b) put the ring into the "high click" UI by clicking 26x and then holding. That'll bump the number of presses required to switch modes up to 4. It really cuts down on accidental mode changes.
I'm jotting down the full-off suggestion for any future revisions though
I believe I tried it with yours before I shipped it - with all 3 LED's lit the light is a little pinkish, but bearable if you were looking for absolute full-blast brightness at the cost of tint.