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Launch times for apps should now be under 1s, however, at least if you structure them carefully. You could implement a custom splash screen as the app launches but just after the system one, and change it from time to time.
Personally, I'm hoping not to see many splash screens, unless it's maybe a one-time thing, or a time-filler for a really big app which one already expects to take a long time to load (e.g. some games).
You can ue QSettings to read/write your configuation specs upon open/close. I don't know your context but I agree with Peter, spash screens on a phone are undesirable. What if you saw a Spash screen every time you openned say your contacts app.
Q-T is right about QSettings being useful for saving configuration stuff, but unfortunately the system splashscreen stuff is read from metadata that is read-only once a signed app is installed. There are no APIs to change it, so the in-app approach for a custom splashscreen is your only option.
Heh. Lots of dislike for splash screens. I don't like them either, actually -- the idea was just to display the last picture the user had on the screen. Load time is probably quick enough to not worry about it, though. The time difference between loading it myself and everything else being ready to run is negligible.
