Well, IMHO readability is not an issue. The difference between "Playback
Settings" and "Playback settings" is minimal and even to the "title
case"-used eye, it makes sense.
If we go for title case we will have to choose which strings should use it
and what type. Even if it is not as complicated as you say I don't find a
reason to not just stick to sentence case. Title case is just a habit and
yes I am one used to it too, but I find it easier to maintain sentence
case.
I prefer title case for menus, but it ocurrs to me that if you want sentence
case always, that can be automatically generated (just drop all but the
first capital), whereas title case can't if it's used selectively.
So why not keep title (but make it consistent), and either auto-generate a
non-title file or just do it in the code?
--
gl