That's actually a pretty cool idea! A mind probe with LoS requirement can be done in even regular OpenXCom, that's what the psi line of sight mod does (as well as doing it on psi-amps and on the alien psi-weapon). Not much of a spy glass though, as it would require to be within 20 tiles, but I guess you're really using it to look at your target in details, instead of seeing them from far away.
Another thing that could help new players: A bit of foreshadowing on assault rifles? Something like: "Not all parts of this gun are made equal. With the right combination, we could put some wicked gun together." I sold all the assault rifles I found in the early game because they weren't useful at he time. Now I sorely regret it! It feels like a trap for newbies, since one is sure to remember for a later playthrough.