Helmet- The Helmet is coming along, but here is the thing. Tech-based helmets, such as Power Armor Helmets and the NCR Ranger Helmets aren't equip with zoom lenses and such. It isn't as easy as just plugging Binocular optics into them and zooming around. It is both do to Fallout's History concept(I.e. 50's generation plunged into nuclear war then having to rebuild in the futuristic wasteland after groups like the Enclave try to reclaim it with advanced Nuclear tech.) and world assembly. Examples of advanced Helmets are the NCR Ranger's Helmets, with come equipped with Night Vision, but it doesn't zoom or pin-point anything, or do any of the extra functions. It simply makes the lens of the helmet see in the dark. A helmet in the Fallout universe isn't as equip as you might think my friend.

Scope- There are Night Vision Scopes, though there is no case in which Thermal vision has been introduced in a major way, this both for aesthetic and feel of the Universe. The developers intentionally left out the prosperity of Thermal vision. 

Rope Darts- Rope Darts are real, yes, but however they are a thrown weapon, and not all that grand in functionality to be honest. They were mostly for restraining active hostiles by throwing them into flesh and destabilizing the unit or by using martial arts(in a rather flashy and un-realistic manner) to wrap-up or tie down the target. Your suggestion of "crossing gaps" wouldn't be possible as they are simply rope with a small dirk on the end of them. There won't be trees and such to throw them into, it is rock, sand, dirt, and metal in the Mojave. 

Boots- There is in no way, shape, or form the type of technology you are talking about, and honestly I am happy for that matter in this universe. I dislike the concept, it is another type of "master key" where it can be pulled out in any situation to negate certain aspects of writing. Boots are Boots my friend, whether made of cloth, leather, or Metal, there is no repulsor tech in Fallout. Boots are made for walking.