With the ProApps update that shipped last night (for FCP5.1.1), you can now make a 1080p24 HDV sequence. You can also now use MPEGStreamclip to convert an m2t into a 1080p24 HDV quicktime file. So, aside from capturing the 24F directly within FCP, you can now cut footage shot 24f in FCP. Use VirtualDVHS to capture (or copy off a firestore), MPEGStreamclip it to 1080p24 HDV, make a proper sequence in FCP and go. Timing seems to stay correct, and there's no duplicate frames.