You can open the WallCutter options window (Blue C icon on the toolbar) and set the cut depth for the specific component to 1.

If you are doing Mass Modeling (single face walls) you may also want to turn on the window or door's 'Mass Modeling - Reveals' setting. This will add the "fake" inner reveals of the wall to make it look thicker. You can also play around with the 'Inset' setting to move the window in and out in relation to the face it was placed on.

Generally, I'd recommend to have the walls enclosed in a component or in a group. And place the wall cutting components outside of the wall component/group.

mass modeling.png