So, did we arrive to conclusion that game engine has it's limits?

In other words (like dale already mentioned) the binoculars could be made but they would only show u the same as scopes. Buy yourself used Kulak-F2000 and u have it.
The only difference that remains is "equip and zoom" (weapon scopes) vs. just "equip" (binoculars).
Additional functions like nightvision, and infra-red would be cool.
Also all the other, additional features that were mentioned (what's in the backpack, how many kills, etc). Those sound more like scanner features but why not combine both in the same device. If (and when) AW will get all this advanced stuff is whole another question thou.
What about marking the mobs, i'd say it might seem like a good idea at first because it makes hunters life easier, but... as i described in one earlier post, i prefer the good old-fashioned measure distances by naked eye, use your experience (or train this, if u have none) and keep an eye on the ever changing situation on the radar (including, try remember which red dot was what mob). Why?
Make it easy and u kill the thrill, make it safe and u make it boring...