It is sure that you could always make the divitsion higher, however that would just take less long for it to beep at faster intervalls and ultimately explode. You could try making the devision a bit higher and bringing the time to a huge value. Or, you could set the interval between each beep the same. At worst, you could add the funtion manualy by putting a new time for each LED and sound.

Its fine.

Go ahead, this is a CC0 project. You are free to do what you like.