How to make FMS drop messages when streaming live RTMP?

Hi,
Our application requires 0 latency live video, or more precisely an interactive video, very much like a video conference applicaiton.
We currently publish an RTMP stream, carrying a VP6 encoded video to Red5 (and we are evaluating FMS and Wowza as alternatives). Our client is, of course, flash based, and contains a player that shows the video.
My question in general is how I can get the smallest possible latency when using RTMP in FMS, even when the user's network connection does not allow him/her to get the full stream (for instance, when I publish 100kbps stream and the user is limited to 80). Basically, what I would like to see in those cases is FMS drop the frames that are not the latest ones. I tried to configure FMS using this guide, but I am not sure if any of the parameters I changes shoudl do the trick. At any case, I don't get the 0 latency I am looking for.
I also noticed a columnin the clients view of the admin console named "Drops", but the tooltip says "Messages dropped by the client". I think I am looking for messages dropped by the server.
So, does FMS drop messages/frames by default when streaming RTMP and the bandwidth to client is not enough, or should I configure it to do so? How?
I am aware of the fact there are better technologies to do what I am trying to do, with adaptive/dynamic streaming. I am also trying to understand whether I have to move to such technologies or I can stick with RTMP.
Thanks.

live_recorded is only to serve your recorded files, there is no way you can record as "live" be default disables recording.

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