I also have patched by XV but to increase the size of thumbnails in the Visual Schnauzer. and adjust the default size of the VS window based on the thumbnail size.
I did this as I find the default 80x60 size a tad on the small size. The resulting XV can still read the smaler older thumbnails, but older XV's will just ignore and rebuild the larger thumbnails if it encounders them.
This will probably never make it into the standard XV jumbo patch, unless it is setup as a compile time option.
For details see my xv modifications page...
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