My English is poor and maybe I did not describe it well, because nobody is plus, although it is really something useful :)

The rule that allows to associate the device with the contract and document - based on the device serial number.

We realy need it. Please add this future :)

For example, I have 100 licenses. Under this license, I can install ...
100x Program1 or...
100x Program2 or...
40x Program1 and 60x Program2 or...
60x Program1 and 40x Program2.
The sum of the installations of both programs cannot exceed 100. Now I can only add two separate licenses for 100, but that's a lie because I don't have 200. I should add license with 50 per Program1 and 50 per Program2? Also bad because I can install more Program1 and will have an over quota. Installations of different programs should count under one license and subtract from the total number.