Transit newbie, lots to learn about.
As a rider, I find the branching on makes for disappointing frequency to the Rockaways. How about sending all trains to the Rockaways and converting service to Lefferts Blvd to a shuttle? Average weekday ridership of the Rockaways and Lefferts Blvd branch is 47k combined (2019). I presume this isn't a threshold to make any infrastructure investment. So fantasy time.
Reconfiguring Rockaway Blvd station: construct a new track on the north or south side to serve as the terminal for the Lefferts Blvd shuttle and a switch west of 104 St. South side appears more open, but I don't know if there is enough room on the street. What frequency does the single-track section set for the shuttle?
New track on south at left; new track on north at right. New tracks in green (normal service) and black (if coming from/going to Pitkin Yard)
Higher ridership from Beach 67 St to Far Rockaway suggests the increased service (now 10-12 tph) go to Far Rockaway. Is the Rockaway Park shuttle merging in front of trains at Broad Channel bottleneck at that rate? Can the Far Rockaway terminal handle the higher frequency?