Has anyone heard of a wallpaper manager that will let you customize the length of time before an image change when running a wallpaper slideshow?

Say I have three wallpapers in a directory:

c:\wallpaper\flower.jpg

c:\wallpaper\river.jpg

c:\wallpaper\mountain.jpg

I know how to set up a slideshow so each image is on screen for 1 minute before transitioning to the next.  That's built into windows.

But let's say I really, really, really like my flower picture and don't care much for the mountain what I'd like is:

c:\wallpaper\flower.jpg  600

c:\wallpaper\river.jpg

c:\wallpaper\mountain.jog 30

The flower is displayed for 10 minutes, the mountain for 30 seconds, and the river for the default 60 seconds.  My temporary work around is to set the transition to 30 seconds and make copies of the files like this:

c:\wallpaper\flower-1.jpg

c:\wallpaper\flower-2.jpg

c:\wallpaper\flower-3.jpg

c:\wallpaper\flower-4.jpg

etc

c:\wallpaper\flower-20.jpg

c:\wallpaper\river-1.jpg

c:\wallpaper\river-2.jpg

c:\wallpaper\mountain.jpg

Make sure it doesn't shuffle the images and it will display the 20 copies of the flower image for 30 seconds each for a total of 10 minutes. and so on.

Maybe this is the excuse I need to get the free community edition of visual studio.