App store review guidelines don't mention orientation explicitly. They only say you are bound by the terms of Human Interface Guidelines.
And Human Interface Guidelines say you *should* support both orientations.
As HelLRaiseR said, 'Five magical amulets' was approved, but maybe it depends on which of the reviewers is looking at your app, I don't know.
That said, of course it would be better if WME Lite supported orientation changes, but I had to disable the (unfinished) implementation in SDL, because it didn't work properly. I didn't have time to look into it since then.