I know about and have used the following,   Place Anywhere, HomeMaker, Odinator...(That mod that allows you to place all the items as statics)   Seems to me that those fix up the Settlement game, no idea why they shipped it without some of the functions of Place Anywhere.   In previous Bethsada Titles there were mods that were must have or try kind of mods although admittedly I wont be surprised if these don't actually exist in nice packages, some examples,   Fallout 3, FWE, Fallout W