Yes. I already have the first two #ifdefs in my application just to get kinetic scrolling. And here is the best part: as far as I can gather, that's not even platform-specific code (works for all of Maemo), but just a hack for Maemo 5! In Maemo 6, it will be done differently (i.e. there will be no QMaemo5KineticScroller)!

So either stick to vanilla Qt (which means your app compiles and runs also on Symbian, Windows and Mac) or be prepared to target *just* Maemo 5, then later *just* Maemo 6.