TL;DR
Improve copy/paste functionality remembering last paste direction.What ?
I suggest the copy/paste functionality to remember the direction in which you pasted the last time a certain design.It could be extended to blueprints but this might be harder to implement.
Why ?
It is a bit annoying to press R (or Shift + R) every time you want to paste a design that is not in the needed direction. This happens usually with train railways and complex walls (with roboports, turrets, electric poles... and even railways).As a workaround the player can just paste the design in the proper direction and copy it, but this might potentially result in having 4 copies of every design in your clipboard.
How ?
I think it’s a simple implementation, I’d do it with just a 0 to 3 integer with the number of 90 deg rotations from the original copy.I hope you consider it a good idea.