Not sure about whether or not the flow grid idea has been taken into account/considered by the team (@dspreadbury ?) , but as I was just talking about it again in an other topic I quickly sketched out (in Sketch) a rough UI idea to illustrate what I meant (one is the screenshot of how flows are displayed currently, one is a screenshot of a panel idea with a grid in which flows could be dragged vertically or horizontally to be rearranged, or just vertically in the leftside flow list) :
