From what I read not being able to easily find neutral is a common complaint with Mercury top mount controls. Some have even swapped out for different brand. On one forum someone said that only adjustment is at the motor. I am thinking that maybe he does not refer to throttle friction and detent on the control box as adjustments.
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L