For those who are bipolar, too high (mania) is a negative thing. Traditional measurements on a scale of 1 - 10 don’t really allow for this, as 10 is supposed to be best. For bipolar you want the nice and balanced middle area to be the best. It’s extremely useful to track bipolar swings to see how hard you’re swinging (thus helping in the medication adjustment process), predict when the next high or low will be, etc.
My idea would be to create a scale that allows for about 3 or 4 levels within each - 3-4 low, 3-4 normal, 3-4 high. Of course, there might be better options, but the main idea is that not every low or high swing is the same, there are varying levels of severity. It’s useful to see exactly how low or high you are going (are my medications really working well enough?). I would suggest something with more layers than just “manic, normal, depressive.”