A true "scale" racetrack actually has corner radii that are much bigger than anything you would come across on all but the largest outdoor RC tracks, so steering lock in that sense is not an issue. I think you must be thinking of running on a narrow, tight track. At the speeds you would navigate corners at, the extra tyre scrub of a drift chassis with grip tyres will not be an issue.
However it would be nice to see how a scale RWD grip car works out.