This is really an addendum to the last post.
The ProApps update did add 1080p24 HDV support to Quicktime. This means that you can now capture with VirtualDVHS and use MpegStreamclip to convert those files to 24p HDV files. Then, edit your sequence preset to look like this:
Hit ok, double click the sequence in your bin, and bathe in the warm glow of native 24p HDV editing.
Next to test: footage off a Firestore, and whether the timing is actually right.
[Edit] Timing does seem to be right [/Edit]
[Edit2] 24F footage captured to a firestore and converted with MPEGStreamclip seems to work too [/Edit]