On a related note regarding your first question.
There are 4 different ways of using your link/cyberdeck etc.
You can have a datajack giving you DNI, a cable and noise reduction. With DNI you merely need to think of something and your deck does it for you. just hacked a roto drone? you can get it to mentally turn on its former corporate masters and fire its gun at them
Second you have the trodes as already mentioned- these also gives you DNI, but no cable or noise reduction. But more essence friendly.
Third you have the Imagelink/cybereyes, soundlink/cyberears and AR gloves. This doesnt give you DNI, so you have to move your hands to get things done. Want to hack that rotodrone? use your AR virtual keyboard and do some hacking+logic with your AR gloves to get some marks on it. Then use your hands and take control of the AR image of the drone and point it towards the corporate goons and fire away with your agility+gunnery at those bastards.
The fourth option is not using anything at all, besides your cyberdeck/link- this works in the same way that a smartphone works today- meaning you would have to have it in your hand and press its buttons physically to make it do stuff. It most likely also have a camera so you can use it to see AR - kinda like when kids today are running around trying to catch pokemons. You still roll your normal dice pools as the others but you need at least 1 hand free, maybe even both. Its useful if you have some negative qualities concerning AR.
The last 2 options wont allow you to go into VR.