Although it would be more expensive, you could use a nutchip.
It has 4 inputs and 4 outputs.
You could tie four dip switches to the inputs and give you the selectable timing rates you are looking for.
The nutchip is programmable with a serial connection to your computer.
Once you program it, you dont need to leave it connected to the PC. Plus it uses 5 volt power.
Learn more about the NutchipEdit: I was thinking of another post where someone wanted 5 volt timers. You will need to add a 5 volt regulator to use the nutchip on 12 volts.