Along the lines of other measures to improve question titles, could we encourage users to use sensible casing in their questions by ensuring that the correct casing is used in the title and tag watermarks?
We've implemented a word filter on question titles to stop users from asking typically "poor quality" questions, and while I don't think anyone's actively thought "Oh, they don't like capitals here, so I'll post in lower case" I'd like to think if we set a good example here they might stop and think "Oh, I should use proper casing".
When editing a post the first item in the right hand "How to Edit" list is "fix grammatical or spelling errors" which I believe covers capitalisation as well.
In response to the comments "This is house style", the reason I'm asking for this is to help us on LEGO Answers honour the LEGO Group's "Fair Play" requests to use their trademark in a specific way - All caps and as an adjective, we're good on the adjective, not so good on the casing, and before anyone says we're not fussed about that here, let me point you at the Stack Exchange Trademark Guidance Page where we're asked to:
As a name, Stack Overflow, is always written "Stack Overflow" (two words, capital letters). [...] Currently, all Stack Exchange Network sites follow this convention: Server Fault (serverfault.com), Super User (superuser.com), etc.
Everywhere else on our site all official (i.e. site copy) uses of the word "LEGO" are now following the fair play policy, and while we don't enforce capitalisation on our users, if we happen to be editing a question/answer for other reasons, we'll generally tidy it up, and adjectivise it.