Yo I have a great idea.  Why not put a button near the  Erase all particles and walls button that resets all of the air pressure. A good reason to add this is because when you do something that alters your air pressure and your in the middle of something and you add any kind of powder the powder flies everywhere.  I hate this because I have to cut the items and then reset the scene and then re-paste the item and that doesn't always fix it so this button would help a lot. Thanks!

Neospector you do have a good point using the hot keys but not every body has the time to remember all of the hot keys.  And a lot of the people that just get the game don't know how to open the lua command line.