Hi there,
Should be easy, Ruud/Mitch have recently fixed a lot of bugs with steering wheel auto detection, so when you're ingame, go in options & auto detect your wheel, then go to the next page & continue your settings as you wish.
Racer supports everything, so you should be happy !
Check also the car.ini or racer.ini to disable automatic gearbox (just do a search in both files for 'automatic' for quick setup)...
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G25
Surround Mode