woah thanks for the feedback!
facilities only push output onto belts that are aligned, never really thought about giving the option of pushing output onto misaligned belts but that could be interesting.
as for splitters, mergers and bridges, i've thought about implementing those but settled for having 'soft splitting' belts for now. you can split belts by placing perpendicular belts next to one you want to split the throughput of.
blueprints im not planning would probably take a lot of effort for me to make but i'll probably add that at some point. the copy function makes more sense to be repeatable and was a quick fix so i already added that.
i'd never thought about adding control to the area expansion! that's a good idea.
you can rotate directly during quick move and i didn't realise you couldn't stash during it. i'll look into that since i'm pretty sure it's supposed to be possible.
i'm not sure what you mean with rotation in regard to symmetry though?
anyway, thanks again for playing and commenting!