I think it could increase the engineering squads’ quality of life if we had the options to rotate an item using the arrow keys instead of having to perfectly get the mouse on the right angle of an area.
Specifically, when adding barbed wire or sandbags to defend an objective, barbed wire will usually rotate 90 degrees if you move your mouse even a bit depending on how it catches. The arrow keys would allow you to smoothly rotate the object 360 degrees and stop at the appropriate angle for whatever situation you may need.