Also the Sniping weapon enchant is an option.
Consider, if you allow Rogues to take Slayer Talents(without limiting language), they can then use that to take Ranger Combat Style as well. At that point, why even have a Slayer class?
If the whole point is to confuse the new player less, you are just moving the goalpost (the range of the sneak attack). So first time the enemy is just out of range they will have the same confusion, but now if they actually read the rulebook or play in someone else's game they will also have the confusion when the 30' range is enforced.
In the end, would it be OP? Well probably not (other than giving rogues an pre-req-less method of TWF), and especially not in the hands of a new player, but I don't think it solves the confusion issue. If its the player pushing the range change, mention the items. They aren't cheap, but it gives them a goal to work toward.