Very nice review of Senna, Steve.
One question. "One final note: The upcoming Blu-Ray edition of Senna also contains an extended cut of the feature that runs about an hour longer! I haven't seen the longer cut, so I can't endorse it, but it is coming."
When? Where? Details if you have them, please.
Also, I agree with the film's tendencies to gloss over certain areas of Senna's life. If you haven't seen it already, I would recommend the film that Top Gear did during Series 15 (Episode 5, specifically. Review here) as a companion piece.