Oh dear!
Firstly get yourself to the OFNA website where you can download the manual for your car. That will help.
It sounds like you may have a dodgy spring in your clutch. Does the engine stall when you use the brakes or just come to a halt? I would be tempted to buy new shoes and springs and install them yourself.
As for the buggy running backwards I have heard accounts before but never when the engine is still running. Usually it has been when the engine has restarted, and even then I think the last time I heard anything like that was a year or so ago. It might be worth searching around on here as I don't have an answer for the backwards thing
Try [link=http://www.rcuniverse.com/forum/m_1341817/anchors_1344518/mpage_1/key_engine%252Crunning%252Cbackwards/anchor/tm.htm#1344518]here[/link] for a start I got one fore you.