About The mongols' watch tower?

I do really like the mechanism of mongols about nomadic strategy, it’s more like the zerg of StarCraftII,the most important part, the watch tower,each time i want to build a new one and i want to save more woods in produce the rider, so i special put the all watch tower in a group and check the range circle, to prevent the wasting. please add a function that when you build a watch tower it shows the range the recent ones has.Please