There's a cost to supporting IE6, and a cost to not supporting it. Depending on what you're doing, it might make much better sense to do something like:

http://code.google.com/p/ie6-upgrade-warning/

IE6 usage is falling fast, even in China.

I want to be able to repeatedly replay selected moments in videos.

So, I hover my mouse pointer over the seek slider at a certain point in the video so that I can repeatedly click that point to repeatedly replay that particular moment.

But most video players (including Flowplayer) cause the controls to disappear after a few seconds, even if I just barely clicked.

This forces me to wiggle the mouse to wake up the controls right when I don't want to move my mouse because it's remembering a position in the video for me.

I would welcome any solution to this problem. A keyboard solution might work well. Youtube has keyboard shortcuts '1', '2', '3', for jumping to 10%, 20%, 30% into the video. I wish you could hit '.' or something to jump to the last position I set by clicking my mouse on the seek slider.

Also, I wish the controls did not fade away when I am hovering over them, using them.

By the way, Flowplayer seems to have a bug: if I attempt to hover over a point in the seek slider and repeatedly seek to that point, after the first click or two, it begins ignoring my seek request.

By way of contrast, YouTube players open the video in a new window when embedded in other sites.

Given FlowPlayer players will often find themselves in similar-looking situations (embedded in a post, or whatever), there's potential for confusion or hesitation there.

2) That's intentional. Flowplayer is designed so that you can have multiple instances on a page and you can control one when you hover it or control with keyboard. When you're outside the player keyboard should control the page. For example spacebar will scroll one page.

Left/Right are already there in current version.

Slow motion and "?" are both good ideas. Probably implement them too.