Wall paper strech/tile/center

Is there a way to tell the launcher to load the wallpaper bmp file centered or tiled vs streched. To change now, you have to let it load and then use desktop properties to change, if needed.

Also, it would be nice to have some Portable Apps logo bmps available to use for desktop wall paper. The wall paper swapper is nice - it reminds me to remove my memory stick before leaving the computer after I have been working for a while. having a Portable Apps bmp would sever as an additional reminder.