Wasn't this supposed to be added? I'm placing stone road right now and neither the iron hammer or the stone road tool allows me to hold F to select anything other than placing 1 road block at a time.
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Stone Roads are actually not available for that, due to them not having forms as the asphalt roads and dirt roads being placed in a different way. It's been overlooked in my opinion and as far as I know we plan to introduce the F tool for Sone Roads in a future update as well, but I don't yet know when that might happen.