ooooh TTB you have been Mod'd lol
In seriousness though the wiki page has some details on studies that were undertaken to come up with PAX brace positions (why for instance in the UK it is all the way forward and hands on head whereas the rest of the world is hands on the seat in front or grab ankles). I know Wikipedia is not the be all and end all (indeed they can't even spell Encyclopaedia), but taken with a pinch of salt the article is quite interesting.
I assume by rear facing seats you would refer to BA (only rear facing pax seats I can think of). The answer is I don't know but I can think of a few reasons with regards the shape of the seat and the fact that crew are in a four point harness as opposed to a lap strap which may make a difference.