Better to ask next time on the P2 forum. As to your question- as of FCP right now you have to be capturing as uncontrollable device. Not a big deal as there is no tape timecode to match to anyway.
Whoa- this is DV day isn’t it? The downconverts look as great as any standard DV camera. That said, you can always shoot on tape for everything DV and then simply 720p for your slowmo shots if you wanted to.