Measuring instruments would be useful.
There is a game manual (however it is on the forum)
Just opening a new tab would help with this
Rank is used to allows other people to compare how effective, experienced or just terrible a player is
What do you mean by sense in the building queue? Building queuing is High Command only
Currently you can destroy enemy resources, but it would be interesting to look at the details on stealing resources.
Paratroopers. They've been discussed a lot and in detail in many, many threads, and I believe the last I heard was that the devs were taking a look at it.
Hope that helps