I didn't realize the DCR has an ongoing design effort to redesign the Jamaicaway. Its been in the works for years. In the
Jamaica Plain news this week some folks post a letter requesting the Jamaicaway and Arborway to remain as parkways. I prefer Alternate 2 that deletes Kelly Circle but retains the rotary at Centre Street as part of the parkway and separates the southbound carriageway completely from through traffic. I assume that neighborhood folks would consider all intersections with traffic control an improvement for pedestrians. Here is the link to the 4 alternatives in design as DCR.
parkway-4-schematic-designs