Vlad I'll take a stab — in a sense I guess I've been looking at this much like the iOS Low Power Mode, which I can manually enable of course, but also I believe it automatically kicks in at 20% and tunes off once battery reaches 80%.
These seem like reasonable guidelines, although if I were to be greedy (!) I'd suggest perhaps you could make it possible for users to set those thresholds, perhaps behind an "Advanced…" button so as to keep things simple for most users.
The other obvious model is the macOS Battery preferences which gives you 2 groups of settings for when you're on Battery and on Power Adapter.
Personally, in that case I'd have Orion Low Power Mode set to turn on as toon as I'm on battery.
Hmmmm, I've been away for a while, I guess I'm talking about the same as I mentioned here: https://orionfeedback.org/d/1069-power-saving-user-settings-aka-auto-enable-low-power-mode-on-battery
…and @Vlad suggested I come up with a concrete proposal! 😆
Guess I should try to think it through more. 🤔💭