I remember when I found out you could do that, but I don't think it works in some of the older versions (which is odd, because usually it is the opposite). I think it was EE that would cancel everything your shrine was building and everything a peon was going to build. I think it even canceled a building if it wasn't finished yet, but I could just be having fuzzy memory. I'll have to go test that on EE 2.33a and Exiled.