Implement fast forward and rewind
With progressive speed options
Eg. 1.5x, 2x, 4x, 8x, 16x, 32x
This is really hard, I am looking into it
This is something microsoft hasn't perfected...... Good luck!
If you go by how media control has progressed you'll see that ff/rw doesn't work all that well, especially with big mkv files etc...
this is a better solution... http://videobrowser.uservoice.com/pages/general/suggestions/96674-add-option-for-big-and-small-skip-like-xbmc
Thanks for the tip works like a charm for me, Media Control
Hope you find a way. Also take a look at Media Control (http://damienbt.free.fr/) that seems to offer this option with avi's and mkv's. It's not flawless, but does work most of the time.