Alt-rightclick will fire on an area. So turn off fire at will, then alt-rightclick on the area you want to saturate. I was using this playing around last night to demolish enemies with my Organ Gun Army.
I thought you just needed to do a click on the terrain?
It doesn't give any indicator of where the cannon is targeting though which is a bit of a pain.
maybe those guys should be doing something more useful...
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