Thank you for considering adding these options.
A simple uncompressed format allows me access to the actual RGB screen data, for further processing.
Capturing at a fast rate is useful for screens with windows showing video or animation. I tried this option with hardware acceleration turned off (as you recommended), and it seems to be working fine.
I agree with f0dder that faster capture is best achieved with no compression at all.
Could anyone recommend a screencast software that stores the captured video as successive individual files instead of or in addition to AVI or flash?