Given that a N900 can at any given time be either overclocked or not; and that the FCam developers MUST develop something that works on official N900 firmware, I do not think they should spend a single hour conforming to an overclockers kernel until after v. 1.0 release. If you try to develop the perfect application, no one will ever see it. If you develop a good application, you can improve it once it has had a good reception. If it doesn't get a good reception, spending time on conforming it to a different kernel is not only a delay but a pointless one.