I received this copper TS10 a few days ago and I finally got some time to do that mod that I also do when I receive a TS10.
When shipped, the aux leds (regardless of colour) are always too bright and drain the battery too fast for my liking.
For the orange aux, I added a 510Ω resistor, which dims it down to a comfortable brightness IMO. I don't have the numbers right now but the battery will also last much longer in high mode. Here are some pictures to show the difference.
High mode: left - no resistor added, right - 510Ω resistor added
Low mode: left - no resistor added, right - 510Ω resistor added
High mode after modding: 510Ω resistors added to both lights, much better
As an indicator at night, low work quite well for me. With the latest firmware it is possible to use the aux LEDs to blink out numbers (like battery voltage). It is also possible to use the aux LEDs as a separate channel in all modes. With these features the high aux brightness isn't that bad anymore.
Yes I have installed the new multi-channel branch on all my TS10s. I suppose if you want to use the aux as a channel then you could prefer it to be brighter.
For myself, my aux leds are in high mode when in standby, and go to low mode when auto-lockout kicks in.