Model2 emulator will work fine with a analog (270) steering wheel. I've used it many times.
Also, I'm pretty sure you can assign joysticks and axis as needed. I have a PS2 gamepad (primary) and a Logitech steering wheel on my computer, I don't remember having any problem.
You may use different axis for brakes and accelerator (recommended if you have the hardware) or use combined axis (the configuration may be a bit confusing at first).
You'll have to assign controls on a game by game basis, as some games use one axis for brakes and others use that same axis for accelerator. Also, some games expect a floored pedal to register 0, while others expect it to register 65535... Play with the configuration and you'll learn how to assign, combine and invert axis as needed.
Model2 is a great emulator, I'd love to see pictures of your cab running Indy 500 or Super GT 24h!
I really can't remember about Viva Nonno. I *think* played it with my steering wheel. according to the site, it should accept analog pads...
Anyway, I found Viva Nonno less than perfect at the time, with the cars running half way buried into the ground, lot's of graphic glitches... Barely useful... It's a pitty no work has been done on it lately, Ridge Racer would be a great game to have in a cab.