instead of using time remappping, just take your sequence up to the point of the freeze and put that on one layer. Then take the frozen frame, make it as long as you need it, and put it on another layer that begins where the other stops, then make a third layer of the remainder of the footage and put it where you need it to start up again.
I've done this many times to freeze animations where I need them to freeze for adding bullet points of info about the subject I'm illustrating in my animations. An example of this is at
http://www.roncoy.com/Demo.html in the top right video where the animation swings around and stops to allow the text to point to the relevant parts of the model.
You can also time remap the moving footage parts to gradually slow down and speed back up, without having to jack around with the timing as much as when the time remap has to deal with the entire piece of footage as a whole. What I mean is, it's easier to work with time remap when you're only dealing with a speed up or slow down, as opposed to both on the same piece of footage on the same layer... at least in my experience.
