Roomle offers shortcuts to speed up your workflow. Below you can see all the possibilities:
Note: user CTRL instead of CMD on Windows.
CMD + S - Save
CMD + Z - Undo
CMD + SHIFT + Z - Redo
CMD - drag rectangle with left mouse button Multi select
CMD + p Print
Backsp./Del. Remove a selected object
You can also view the shortcuts when you click on the Information button in the toolbar (looks like a question mark) next to the Settings.