Is there a way to simulate gravity in the VAB or SPH?

[nukeboyt]

I am working on a craft that has IR parts that need to be aligned just-so, but when I take it to the launch pad, gravity makes it sag, and changes the alignment ever so slightly that it no longer flys correctly. Of course I could add quantum struts and reaction wheels, but I was wondering if anyone has heard of a method to simulate gravity in the VAB? I think this would be cool. You could see how your craft would behave on Kerbin, Eve, etc.

[hab136]

This would basically require physics to be enabled in the editor.