Just got a reply from Zebralight that is rather interesting. I hope they do look into the beacon button.
Thanks for your comments and suggestion. You may notice that we haven't done any UI update in the last 4 years ever since the PID thermal regulation was introduced. That's because we ran out of firmware memory space (can't add anything) in that tiny microcontroller chip. The SC600Fd III Plus is based a new platform that doubles the firmware memory space, has more internal brightness levels (the PID still use 384 levels, but the main H1, ... L2 levels are picked from 768 internal levels), and comes with some other improvements. Starting with the SC600Fd III Plus, we'll realign all main brightness levels. We'll look into the 'OFF state beacon indicator'. Thanks.
Sincerely,
ZebraLight, Inc.