Vinh, I really appreciate that you're asking us for input. I know it can be hard accommodating everybody's wishes with mode groups. There's so many different ways we use these lights and everybody has a different take on what is perfect. Honestly I wish we could program them ourselves by just plugging into a USB port and quickly setting the mode # and levels with our smartphones.
But I digress. Here's is my take:
My thoughts below are a little jumbled, but at the end I'll have an organize list of my preferences for mode groups. Might take a few edits.
Lockout: 3 or possibly 4 clicks for lockout would be much better. 10 clicks is just too many. I use lockout alot on lights where you can't unscrew the tail cap to lockout (fenix)as long as it's quick to do. If a light is prone to coming on by itself, and is inconvenient to lockout, it becomes a shelf queen or sold. My tk75vn was that way.
I like 3 and 4 mode lights. More is just too much unless there are shortcuts to moonlight and turbo.
1% low is great. If the light has moonlight, it is still a great 1st mode up from ML unless it a tight beamed thrower in which case I would only need 2 modes, low would be just to get me into position and help navigate in situation where turbo would be too much. But lets face it, turbo is why I buy v54 throwers. So medium and turbo is all that's needed, unless we're talking about a S&R light where turbo would get too hot and wouldn't last long enough so 65 to 70% is a nice high, with turbo just a double click away.
So for a 3 mode thrower, 20%- 70% -**100%
20 or 30% for a next mode up from low is too big a jump. 10 to 15% would be a nice step up from low without being too wasteful or blinding for medium range tasks. It would also set you up nicely for the next mode:
Next mode of 40 to 50% is nice and bright while giving you roughly twice the runtime of turbo if you know you'll need it to last . It's easy to do the mental math in a search and rescue or emergency situation.
70% is too close to turbo for edc type lights, and makes for too many modes.
No more than 4 regular, non hidden modes. 4 is perfect in fact. 3 is good too, but only if they are spaced right.