I will just chalk t up to poor wording on the activesofts description. As when you VR, there is no typing, there is no muscle movement/usage. You physical body is slumped unconscious for all temps and purposes... 
Are you sure about that?
I'm no Decker expert at all, but, there is a story in CRB IIRC, that has Netcat eating while in VR searching the matrix and exterminating copies of bad fanfic porn with Slamm-O.
She can't see them, but has the bowl situated where her hand knows to go in her lap.
Also, in SR-1 CRB Dodger jacked in at a glorified ATM terminal & was standing upright while jacked in & decking. Not slumped over unconscious in the street.
Their eyes glaze over but to my knowledge they are still "functional", they are not astral mages that are no longer in their bodies.
VR today or even using that Ready Player One movie has you cover your eyes & immerse yourself in what you see but your still up & functional.
I'm not sure if Today or RP1 would be closer to AR or not but I don't think so since in AR the Decker is still very aware of his surroundings visually.
Well we can't trust the fluff stories, as even actual examples of the rules are wrong. But anyways here you go from a quick glance in book, I can probably find more if I look harder:
p.229 - Under user modes and cold-sim.
In virtual reality, or VR mode, your body goes limp and your only sensory input comes from the Matrix.
Your body relaxes and your meat senses are blocked, as though your body were asleep.
Going limp, is pretty much no more muscle movement. Meat senses blocked, makes seeing, perceiving the real world pretty much impossible. No sight, hearing, touch, spatial awareness is pretty much gone, as is muscle control if your limp/asleep.
Taking it farther, if movement was for some reason possible, look at EARRS, and the echo skinwalker... They take a lot of investment and penalties just to have perception (seeing) let alone trying to move...
Also SR-1? Has what to do with SR-5 besides name and background? At least not when it comes to rules. And movies have no bearing (I would say they are closer to AR examples with haptic(physical, not mental) feedback. Not being snarky, just sayin...