I just had a look and I've definitely got space for five digits in the data rate box, so I'm not sure why you'd only have space for up to 9999 Kb/s. Thing is, I tried using 10,000 Kb/s and the video I exported looked a bit rough in the details. I tried it again using 20,000 Kb/s and it seemed to look alright though. I'm sure 10,000 Kb/s was the lower limit before, so either something's changed or I wasn't using a good enough video clip for reference last time I tested this out.
As I understand it, the keyframes are like reference points within the video file. I don't know what all their uses are, but I saw somewhere that they can degrade image quality and that if they're not important for your particular uses you can minimize their effect by setting them to about ten times your frame-rate. I did some testing of it a while back and found it wasn't a big deal in terms of image quality or file size how far apart I set the keyframes, but you should have some in there somewhere.
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