Right now, users can use Shift+Alt to move around in a room editor without a middle mouse button. This is okay but can be made easier by adding an alternative way by pressing the space key.

• Space key is not used in the room editor for anything else (except for form input, but it's ignored anyways)
• Alt+Shift is oftentimes a hotkey to switch keyboard layouts, which can be annoying.
• Old method should be preserved for previous users.