Have you put a feature request in for it? ill vote for it if you create one.
Maybe there is already something in the making and the missing part is how the firmware would be distributed. It may require a separate installer like we know it for X18xx.
For the wheel display there was an update for SC6000 but for LC6000 there was not. (It is about to bet the new icon to differentiate about loop size and beat jump size - maybe someone recognised it) Maybe if Denon DJ is ready it will open doors and we can get whatever we want. 
I press/toggle the sync button a lot during my nights and my lc6000 sync button illumination is woeful, you can’t tell if it’s on or off! I have to check the screen to see if it’s on or off as the illumination difference between on and off is no difference. May as well not have it illuminated at all. It’s really bad, even in a pitch black club. It’s caught me out a few times I’ve thought it wasn’t on and I change the sync lead and if there’s a track playing on the lc6000 it just jumps to the bpm I don’t want it to be. Is something going to happen about this as I own 2 x prime 4’s, 2 x sc5000’s, a prime go, 2 x lc6000’s, everything is great apart from the illumination of the sync button on the lc6000’s. If anyone else is using 4 decks which I do every night I dj you will know this button not illuminating is a proper pain in the arse! Come on denon what’s the solution???
same problem on Prime4+ system on the Sweep FX buttons.
Well I think that this is not a feature request but rather a bug report. Maybe the post is in the wrong place.
So again, if a lit button does not show a clear state, on or off, it is not usable.