Can I modify the automatic save interval?
Yes, access to My Account option and then the User Settings option.
In the window that will open, select the interval in seconds for automatic saving. (The default is 30 seconds after the last scene modification.)
How can I center an object in a scene?
You can adjust the position of an object to the center of the scene by dragging and pressing the Shift key at the same time. The object will be located according to the closest position. With the Shift key you can also adjust the angle of rotation of objects to 45 °.