The wood is already hard, I don't think you need much strength to harden the wood. For such example, wood can either be hardwood or softwood. With an axe, you can cut down either wood regardless of the woodcutting level. Whereas hardwood is thicker than softwood, therefore macroers can achieve the amounts of softwood. By agreeing to the population, you risk both the lives of the PKers and Merchanters who rely greatly on the success of the number of woodcutters that do not macro. By updating as you suppose, the game may be more logical with benefits of the game because of the players that woodcut and they will be the best to chop and not the macroers because the macroers will not be able to chop down the hardwood. Extraodinary Idea!