Have you ever deleted a Room Object and you get a 'deleted but still in project' message? This is a good time-saving feature. Let's say that you build schools, it's a given that you will need the following rooms; Bathroom, Janitor and my favourite, THE Office.
You can pre-make these in your template. When you go to place a Room Object look in the Options Bar (pictured) and drop down the Room list. You have saved yourself from typing the room name and perhaps other important parameters.
More about Room Objects in Schedules here.