Any addons for extra camera shots.. things like the F1 onboard screen etc..

not yet.

duuh, just use the customs views option... lets you fine tune to what ever POV you want..

I have an F1-style onboard cam on every singleseater (except MRT5 ). You don't need an addon for that. You only have to adjust the custom camera.
On the XFR I made myself a nice "mirror-cam". A camera that floats just outside the window of the driverside and is centered on the mirror. That way you can see which car you are chasing and you also see the car behind crawling up into the mirror. Looks nice.

Vain