Thought you were talking about a real shifter from a car. That would be cool, but a lot of work.
I've given is some thought. If I had the time and money to mess around with it, I'd use a gate,
flat springs to offer resistance putting it into and pulling it out of gear. The challenge would be
getting all the springs and microswitches mounted at the right angles. As an example of the flat
springs I'm talking about, here are the ones used in the act labs shifter:
http://www.act-labs.com/scripts/proddetails.asp?Pid=100I really want to do a 6-speed and a clutch when I redo my driving cab again, but can't find enough games to justify it.
As far as the Hi-Lo goes , I have 1st(up) mapped to Lo and 2nd(down) to Hi.
A few mame games use a single button that toggles Hi-Lo.
If you map both gears to the same function in mame, it will work as it should as long as someone doesn't go halfway then they will be reversed.
For some reason, I mapped the right paddle shifter on my wheel as the Hi-Lo toggle for these games.
Not very authentic, but it works for me.