I have a 3 monitor system (sometimes even 4 montiors). Unfortunately only two of the three montiors share the same resolution. My resolutions are:

[1680x1050] [1600x1200] [1600x1200]

Whenever I want to change my desktop wallpaper I usually pick a single image for the left monitor and a dual-monitor image for the two right monitors (because of the differing resolutions). I usually have to stitch these images together myself in Paint.Net before I can apply them with DisplayFusion though because there is no option to choose a wallpaper for the second monitor and have it span onto the third - only the option to have an image spanned across all monitors.

Would you consider adding such an option? Say, "Span image to left monitor(s)" and "Span image to right monitor(s)", or "Span image across (x) monitors".

This is in the works I do believe, we've discussed this in depth here on the forums before and Jon seemed to love the idea. He has said he is aiming for it to come with wallpaper profiles.