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Sure I could add a 3rd or 4th button. I could also add a rotary knob or some capacitive sensing. Same goes here... why would I?

I like tinkering around, too. That's why I've built that thing. And because I like supporting beginners who are interested in this I decided to not only give them the STL files. No, I decided to give them some detailed instructions, a fully working sketch and even commented most of that sketch so people could adjust it to their likings. Something to tinker around with.

The sketch explains pretty much how the leds get grouped to segments, how those segments are drawn and how to display numbers. It shows how to use the DS3231 module. So everything one needs to start adding own stuff is already there. Additiionally to all the great FastLED/neoPixel/WS2812-Guides, DS3231 samples/instructions out there. You don't want to learn how to add this on your own, you don't want to tinker with the sketch. That's fine, it's your choice. As it is your choice to remove a power limitiation without even knowing why and what it is good for (without other code changes you won't notice anything at all).

But my choice is to not put time into something only a single person has been asking for and I absolutely don't need for myself. Especially if this would mean hardware changes and redoing most of the instructions. But this topic has already been covered in the comments.