Changing steering arms and or hubs to gain an extra bit of lock changes the geometry of the existing steering. As long as the power steering option is done correctly these are the things to keep in mind.
Tyres and wheels rubbing the radius rod and the inner wheel well are two of my concerns if increasing the lock.
Caster is adjusted easily by the radius rod. Shorten it by using the existing threaded section to increase the caster. You'll know what I mean when looking at it. The more caster you have the heavier the steering becomes. Only really need to adjust enough to clear the rear of the wheel well and then you may need to cut the lower front corner of the guard.