No, it doesn't work like that. You need different settings for each eyepiece (unless they're parfocal of course).
It's very easy to use, even in the dark, because I use the helical top as focuser. Imagine you have a certain eyepiece in the corrector, of course correctly focused and with the proper corrector setting. Whenever you insert a different eyepiece, turn the helical top up or down until that new eyepiece is focused as well. That's the correct setting for it. I don't touch the focuser at all unless I want some very fine focusing that involves less than, say, 1 or 2 mm focuser movement. Please note that corrector settings would be wrong for subsequent non parfocal eyepieces if you use the focuser instead of the helicap top of the coma corrector.
So you only need to know the correct setting for one eyepiece.
And if you don't even know the correct setting for one eyepiece there's a way to figure it out. Screw out the helical until the lower part of it it's 13.5 mm above the lowest possible setting as showed on this picture:
This way, the focus of the optical system will be exactly on the top end of the helical. I put a piece of translucent tape on the top end, and then, looking at a very bright object with the scope (I used Sirius, but it can be a bright planet or the Moon), I focus it with the scope's focuser on the "screen" created by the tape. The helical should be still at the 13.5 mm mark.
Now, if you knew the exact position of the field stop of your eyepieces, without touching the scope's focuser at all, you'd have to screw the helical in or out until the focus is exactly where the field stop is. So, for instance, if the field stop of an eyepiece is exactly where the body of a 2" EP meets the barrel you wouldn't need to touch anything. But that's not always the case. For instance, I need to screw my ES100 20mm in about 10 mm from that position (so the correct setting is 3-4 mm above the zero point of the scale) until it's in focus. That means the field stop of this eyepiece is 10 mm above the point where the EP's body meets the 2 inches barrel.
This may seem difficult or tedious but remember you only need to do it once. And believe me, once in the correct setting I can't see the slightest hint of coma in any of my eyepieces.
Hope it is clear enough. It's not easy to explain something like this when you're not using your native language.