Rectangle HSS are not always long side vertical. The shear plate command should not force the connection to be along the long side of a rectangles HSS. This should be in relation to either UCS or the system lines.
Currently we are forced to use the 'Moment flange plate' macro. Be creative with the dialog boxes. Then delete the connection box. Make one set of bolts go all the way through the tube, add grip length to account for the other shear plate, and delete the second set of bolts.
I realize this topic may not get many kudos, as it may not be a common problem ran into, but considering the lack of functionality within the shear plate macro while simply dealing with a rec tube on its flat...this certainly should be fixed.