I don't think you can map the buttons for gas and brake towards the analogs. You can map any other buttons to what you want though. Also you can just get a older Xbox for cheaper (A elite) and you will save some money , also the Red Ring of death won't be present too. You can pick up a 60GB hard drive for pretty cheap. That is what I'm using.
Actually just make sure that they were made after 2008 and 2009. The RROD rate dropped drastically. You can check on the back of the Xbox for a Jasper chip which is what keeps the Xbox from overheating. Here is one I found. On Craigslist
http://stlouis.craigslist.org/vgm/2881098839.html
If you don't feel comfortable with the things I told you then you can stick to what you think is best for you.
Actually just make sure that they were made after 2008 and 2009. The RROD rate dropped drastically. You can check on the back of the Xbox for a Jasper chip which is what keeps the Xbox from overheating. Here is one I found. On Craigslist
http://stlouis.craigslist.org/vgm/2881098839.html
If you don't feel comfortable with the things I told you then you can stick to what you think is best for you.