If the user is holding the SHIFT key while placing a new building for construction, the building remains selected for the user to place a new one again. Like in Age of Empires or similar games.
End result:
- Open the build menu.
- Select the building you want to build.
- Locate the location of the new building and SHIFT+CLICK.
- Now SHIFT+CLICK in a new location to place a second one.
- Now SHIFT+CLICK for a third instance, etc.
No need to keep on selecting from the building menu over and over and over ....