Well, to answer my own question, as it were, there does not seem to be any way of reorienting the splash image just using tags and properties of the mobile app. Looking around at the work of some other developers who are using FB4.5 for mobile, it does seem to be a common problem. I suspect we will see a lot more of it as people start to develop increasingly for tablets.
However, going back to the old fun we used to have with custom preloaders works a treat. Of course you can still do animations showing load progress and such like, but I am using the custom preloader purely to ensure correct orientation of the splash image. A very simple preloader will put up the splash image and hold it there for whatever time interval you want after load has finished. Until Adobe put some additional code around the splash image orientation then this seems to be the only resolution.
If anyone does have a good answer that doesn't involve custom preloaders I'd be interested to hear,
Message was edited by: Richard_Abbott
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You're right, the splashScreen in 4.5 doesn't change orientation and it's not possible to set different images for landscape/portrait. In 4.5.1, that was just released, we've updated the splashScreen to reorient like the app normally does, though it's still not possible to specify different images for portraint / landscape. As you've figured out already the work-around is to use a custom preloader.
We've seen requests for a more customizable splashScreen out of the box and we're planning to have that in the future.
that's good news, thanks for the update for 4.5.1 - it'll save me a bit of time and fidldling around!