The problem is that I selected a quarter of the farmers to build.
But the farmers who are mining will stop their work to help build, which is a very difficult problem.
buf, the discussion about automatic tasks or not, depends just what kind of RTS game is the game that you want.
In my case, for soundrts, I take as an example to follow and repeat, is a mixture of age of empires 2, and starcraft. These (for me) are the best rts games, and try to have similar game styles, is the good way.
About the square thin, only say move these peasantsto the nearby square for select them easily; not build at that square.