Personally, I think this would be very beneficial.
As some others have mentioned, it could put additional strain on your system, however if that's an issue for you, you can just decrease the render and smoothing distances in the TAB menu, which would completely negate this.
The main benefits would be applicable to all Patrons, as even if you're not supervising an event or something similar, a further free camera range can be useful when looking to see what's causing congestion, or just checking the state of the road ahead.
In some cases, I've used the free-camera to check the road behind as heavy cargoes can be very slow to accelerate, so having advanced warning of any vehicles there would be highly beneficial and could definitely improve the overall safety of those who had the slightly extended free-camera range.
Therefore, I think that this would be a highly beneficial addition to the game that doesn't completely change the game-play experience (so it's fair to the non-Patrons too), but it provides a slightly improved free-camera function that many people would appreciate and could motivate more players to sign up.
Quality Productions