After using nwm daily for two years, there are a couple of things to improve which crop up occasionally:
have a explicit reset shortcut, which repositions all windows on the current display and current workspace. Useful if, for example, you remove a display in Virtualbox and want to redo the window positions.
when the display size changes, recalculate the offsets of all workspaces: right now, only the current one is recalculated which means that occasionally you can see an old workspace until you switch to it
when hiding windows, reposition them below the current workspace rather than to the left, so that display changes do not cause them to show
After using nwm daily for two years, there are a couple of things to improve which crop up occasionally: