As an otion in the editor for placing background pictures (IE, the backdrops that the walls and everything else show up on top of in the 3d view), we should be able to select a button to "tile" them in every other spot along with another one so as to alternate pics every other spot (it gives the illusion of making distance and walking when playing the mod).
As an illustration, consider the background pics "X" and "O" and they line up like this:
XOXOXO
OXOXOX
and repeat.
-SilentThief
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We can do this when placing backdrops. It's not as simple as an auto-fill, but for those of us that use multiple backdrops per cell, or who want a different backdrop for an interior as opposed to the exterior, it's not very useful.