They can walk, but ive never seen any aliens walk. im not sure if they can.
They can certainly walk, have you never used shift to slow down your granger, or creep silently around with your rant?
Sniping a ret would be gax.

I don't dislike the idea of scrolling back the blueprint distance, i imagine it could come in handy when building in tight spaces.
One thing i find annoying, which i maybe wouldn't notice if i made use of binds for building, is that, if holding shift to move around slowly, calling and confirming the build menu will cancel my walking, even though shift is still held. Ok, so if i'm honest, i've only found it annoying on a couple of occasions when i was particularly concerned about being heard moving around, but still
But isn't that because the map designer didn't want people building there?
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Shouldn't they have marked the area with nobuild, then? i realise mappers sometimes forget, but i'm sure there are legitimate tight spaces that this could help with.