Workshop Plus Mod
MODTransforms Workshop mode into a God simulator - giving you all of the tools you need to create amazing settlements.
MCM allows you to use hotkeys in Workshop mode and is definitely the preferred way to control layers - so if you find it obnoxious to jump in and out of Workshop mode to work with layers - grab MCM and set up those hotkeys!.
To control the options, either access the MCM menu, or if you aren't using it, go to a Chem Workbench and craft the Workshop Plus Controls holotape under Utility.