How do you get the dude to accelerate backwards?
To redirect the eccelerating force hold "SHIFT" and make the line from pulling it to the left<--------- "WHILE HOLDING THE SHIFT BUTTON!!!!
To get a track on youtube you need some sort of recording device...Ask a guy named "CALIFORNIA" about it and he will tell you all about that...then all you need ta do is make an account on youtube, press the UPLOAD button and find the file that the movie is in and it will upload 
...good luck 
See im having the same problem i try to make a reverse acceleration line but whenever i try it does a totally diffrent line in my opinion i think silverlight beta sucks after i downloaded silverlight i lost my old linerider account and now i have this one i had a couple linerider vids but not anymore i switched back to beta 2 just until i find out all these bugs are fixed
To get tracks on to youtube, you have to have a video file (*.Mov, *.Avi, *.Mpeg, ETC.) And have a Youtube account. go onto Youtube, and click the yellow button that says "UPLOAD". Then, Enter in all of the information about he video (Name, Discription, Tags, Etc.) and press "UPLOAD A VIDEO...". the click Browse and locate the video you want on Youtube. Then click UPLOAD VIDEO. Hope it helps
How do you get reverse acceleration? And How do you get the tracks on youtube?