In some instances the title casing you'd like may not be possible, due to our adherence to the strict iTunes Style Guide, which many of the other Digital Music Services follow. Please do take the time to read the style guide as it's full of really valuable information.
There are instances in which some artists will have out-of-specification casing allowed. We've had confirmation from the Digital Music Services that these instances are very much the exception and not the rule. The exceptions are the result of periods of negotiation between the Digital Music Services and the artist's representatives, and often do not involve the distributors at all.
If the Services update their specifications to allow custom title casing, we'll definitely provide an update, as non-standard requests are common.