Make more pedestrian friendly and discourage car use. There has been a fatal collision in 2012 but near hits are common.
Remove the fence around the garden, or add additional entrances on all four corners, to open it up and enable pedestrians to use the garden to cross the square in East-West direction and diagonally. At the moment it doesn't have an exit in the west, making it a dead end and barrier for people moving between Nicolson St and Potterrow.
The pavement on the south (from Mosque kitchen to the libanese restaurant) are far too narrow. Double yellow lines regularly ignored, creating blind corners, making it difficult for pedestrians to cross.
Marshall Street should be narrowed considerably to one lane, as it's really only used for a few bus lines, no need to have two fairly wide lanes here. The southern pavement far too narrow, but it is very busy with pedestrians.
It is used a lot as ratrun between Nicolson Street and Potterrow.