When you will pick Pipe, Sew or other tools that work by selecting two shapes, you will get from command line the proper message to you to select the shape. There is also a bug in autogrouping (in polyline) that was mostly addressed but there is remaining a line that is created and creates extra complexity in algorithm and I did still not found what creates it, but I work on that.
In the meantime I will focus on plugin UI work which was stagnating as bug fixing was with bigger priority.
Update: polyline was fixed to work with as many lines without getting slower. The reason was that as the drawing goes some lines were drawn juxtraposed. This creates close to exponential combinations for auto-face algorithm searching.