There's a problem. Screenshot captor can't stitch images in a vertical strip if there's many of empty white space in the map (gaps). As a workaround I think I can just collect screenshots and stitch them in another program.
But the rest of vertical strips stitched perfectly. Then I used PanoramaStudio to stitch strips automatically into the final image.

I know, it might look totally unnecessary, but it would be nice to have a 64-bit version of your application (for some specific uses as mine is). As far as I know it is the most powerful tool for the screen capturing I have ever seen. Snagit goes on the second place.

Can I enter a 10 GB value here? Will it work? Your program is 32-bit.