I'm personally not sure why they didn't just make the gate snap to the existing path... Instead of having a prebuilt bit of path on the gate when placed, lay the path and then plop the gate on the path where you want it. I know it would be a bit more complicated to program, but it would have been so much easier to build as a player. Especially when making rides and having to close the ride and delete tracks to place a vehicle gate then reopen the ride again.