Data rate when creating Quicktime h.264: difference between download and streaming ?

I've got a question on data rate setting when creating a quicktime movie with h.264 codec:
In the Compression settings dialog I can restrict the data rate to a certain value (e.g. in my case I use 20.000 kbit/s for creating a HD1080i movie).
There is an additional drop box "Optimized for" where I can select between "download", "streaming" and some other value.
Is anybody aware of the exact meaning of these settings ? My impression is, that using "download" I set the average bit-rate, allowing much higher bit-rates in peaks, while "streaming" sets a maximum bit-rate. Is that correct ? or are any other parameters affected by this setting ?
I now discovered, that the output file when using "streaming" with restriction of 20.000 kbit/s leads to a file with average bitrate of only approx 17.000 kbit/s (while it's more or less exactly 20.000 when using the "download" setting). Does that mean, that the overall quality of my output file would be worse ? or would only peak rates be affected (e.g. scenes with a lot of movement) and the overall quality remains the same ?
Happy to learn if anyone has any experiences / best practices on this topic.

Restrict isn't, it seems, a hard limit. When I specify 18Mbps it seems to run up to 21Mbps. But, that's fine since it's certainly isn't excessive and if I really cared I could set it at 15Mbps.
I suspect it might be more accurate with 2-pass. Also, i never ever use the Apple codec. i use x264 which allows more encoding tools. And, even it is not a super good H.264 encoder.
Using rates under 2400Mbps is IMHO asking for the near impossible for good quality SD video.

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