I'm curious why? I don't think I've ever used my boom sprayer on this account. Most weed control is performed with backpack sprayer and I often place dye to help identify where I sprayed. lots and lots of sidewalks that break up sections of turf, not to mention the gigantic building in the middle of the lot. its surrounded by three city blocks and a walking path on the one side...which I steer clear of.
The reason for this is to catch weeds that are not easily seen. Treating a whole lawn will get the weeds you cannot see when spot spraying. Those weeds you do not see will pop up a week or two later. The last thing I want to do on any lawn is to give the idea that I am constantly applying to it.