Yep same file system so pretty much all mods will work, cars, cameras, tracks, tyres, garages, pit crew, OSD, etc...
If you are playing with the wired 360 controller and want full feedback included, i.e. to feel the car on the tarmac (off by default) you will need to adjust the effects file on your Mac which is found here > username>Library>Application Support>Feral Interactive>F1 2012>additional
I have attached mine if you wanted to try it out. Just change the extension from .txt to .xml before using it. I only changed it so I could upload it with this reply.
Two add ons that won't work are kenken's ingenious telemetry mod and visor view mod, both of which need DX11 and use a .dll to inject the code. You can mimic the visor overlay by using a mac app called uberlayer which allows you to overlay a png with transparency in windowed mode. I used that in combination with some global keyboard shortcuts and the app joystick mapper to switch it off when looking backwards on again when looking forwards again in cockpit view. Also I have a prefpane app called to cursorcerer installed to switch off the always persistent mouse cursor that is present when running F1 2012 in windowed mode. Again by using a combination of a global keyboard shortcut and joystick mapper I was doing this by clicking down the right analogue stick.
Feral Interactive did a very good job porting this game, so good in fact that it made me want to experience this game at it's very best so I have just got a dedicated gaming rig. First Windows machine in years.