Hi.
In my experience, it is tiring to click again and again to produce same thing. TotalNoob also complained about this. Other players I encountered tend to produce same unit(s) again and again, spending so much just by clicking the same thing.
Any unit/building that can produce, could have "repeat" button, that would (try to) add currently produced unit to the end of the production queue.
Example:
magic summoner -> daemon, + repeat
-----> produces daemons, as long as there is resource, stops production if no resource is available
Example:
persian tent -> genie, magician, + repeat
-----> produces genie, magician, genie, magician, genie, magician, ...
Thnx