No additional mike clicks to use MicroTower in my experience. Just self announce like you normally would and it reads back the appropriate info.
As the Unicom becomes more and more busy, the MicroTower information becomes truncated in a logical way, i.e. if they are 5 aircraft in the pattern on Unicom announcing runway 29, it’s not going to recommend a runway.
As the Unicom gets more crowded, information is gradually left only to the most useful data-winds, and maybe DA. It’s an intuitive and logical system.