The building queue is good, but I had an idea that could make it better for us to make longer-term plans on each province.
More complex building queue:
Currently we can put 4 buildings & 4 mechanical units making a total limit of 8 on the queue.
My suggestion is that we be given an option to create a more complex queue, based on other factors:
eg.
queue 1: factory 1
queue 2: factory 2
queue 3: artillery (conditional until factory 2 is complete)
eg2.
queue 1: factory 1
queue 2: railroad
queue 3: fortress (if morale is lesser than x%)
queue 4: factory 2 (if queue 3 invalid)