Can't comment on the first as I've never downloaded any IS Fs yet, but for the hand placement, open the car in CM showroom, tick Driver, then Movable Driver, press T, and you'll get some movement axes that you can use to reposition the driver. Do that to find a hand position you're happy with then you can use the options just below the tick box to save it.
That's amazing. When I used to mod F1 Challenge 99-02 doing that was a pain in the ass.
I'll fiddle around with it. Thank you!