I don't think MC does do this. Try a few more.
Well Jim believe it or not but MC indeed does it
I tried 3 CDs which were already in the online database (after my alterations now they are named this way):
Depeche Mode - Speak & Spell [CD Stumm 5]
Depeche Mode - A Broken Frame [CD Stumm 9]
Depeche Mode - Construction Time Again [CD Stumm 13]
No matter what I do the capitalization stays the same for all the tracks. Not only I am unable to change to lower case but I am unable to change it to upper case neither (as I curiously tried on track "Just can't get enough (Schizo mix)" which seems to be only correct one).
I also tried one CD which did not exist in the online database yet:
Multiple Artists - Some Great Celebration
The tracknames kept OK however if I change the capitalization now - again it does not have any impact and they stay as they were when I sent it to online database for the very first time.
And what is really weird: the band on track 9 is called "strange day" and not "Strange Day" and even though I originally filled it correctly, MC apparently changed it to upper case and If I try to correct it now and Send / Receive it stays in upper case...
So these are my findings