I hate the "Idle Colony" message, it seems putting something in the queue that can't be built makes it happy. Is there something more productive that can be done?
Put in one of the four never ending build projects. Then govern that planet, move it's triangle to the edge of the circle on the left or right while keeping the money/happiness where you want it.
If its a manufacturing devoted planet, move it's triangle to the edge of the circle on the left and slam the slider to the left. This will throw all the manufacturing to your shipyard. When you again have something to build on the planet, your going to have to adjust the slider to the right. Lots of micro per planet required to be efficient.
The happiness levels say they change production but I have yet to figure out whats going on.