How to use buttons while in a vehicle?

I’ve always wondered how to use buttons to control stuff without touching the numpad when I’m sitting in a chair. Is it possible without using wiremod? If it is, I’d like to know how. Every time I press E I just exit the chair. If it is only possible using wiremod, can someone tell me how to wire it?

Use the Adv.Pod tool in the I/O section

http://www.facepunch.com/showthread.php?t=566792

This COULD be what you are looking for?