This would be to add the possibility of massively changing various objects (e.g: a set of input pins) common attributes (Facing, label position, font, width, etc).
An example would be:
Creating a 20 in, 20 out circuit, I place the side by side in 2 horizontal rows.
Later I see it would be better to have them in a box design). So I would need to change 10 in and 10 out facings(at least, there would be need to change also label placings).
As logisim is now, I would have to click the in/out, change facing, click the next one, Move it, 20 times
With this feature, I would just change the facing once for each in and out.