Your dreams and imagination evolved as a view into another universe. As with the current beliefs, you cannot decipher technical information -- no words in books, no details of how devices work, so even if you can describe things you see from another place, you could not reproduce a working version.
Now how do you convince others that the things your are seeing are really happening without being labeled insane? And how could you use this information to benefit yourself or others? Take a peek into the multiverse to see how other versions of yourself have solved these problems...
I think most of what you're describing would require focused lucid dreaming, and with #3 it would require that you meet others who are also lucid dreaming? Sure that can be done, but #2 requires you to bring back critical details that the right brain just doesn't seem to be able to handle. This does give me an idea that might get around that limitation though -- what if you could remember images of artwork created in other realities? Basically steal their classic masterpieces (of course I'm still limited in that I cannot paint). And curiously, #1 sounds very much like the descriptions of remote viewing that are supposed to be proof that ESP is real but always fall apart because some details are wrong -- exactly what you would expect from an alternate reality though...