As someone who has probably used 1500+ scaffolding in current playthrough I feel like I can speak on this a little bit. Teehee~
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Having your head collide with the thicker of the scaffoldingwith the crossbeams when the height is 3 is just a little bit annoying, it would be nice if either the player or scaffolding hitbox was altered to remedy this
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For the 1x2 scaffolding, the wood can only ever face one way, there's no mirror option to make it go the other so if you want all your scaffolding to face one way you can't use 1x2 everywhere
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The way scaffolding rotates around one corner makes it difficult to get scaffolding in some places, especially if you want it to face a certain way, so a better way to rotate and place them would be nice
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I think some catwalk blocks or like low fences to go along the edges of scaffolding would be pretty cool to add to the whole factory vibe, metal or wooden
That's all I can really think of now.