Hi, just some suggestions for the next release of your (excellent) product:
1) When there are errors and warnings generated, don't just redirect before we can read them, add a link to proceed so we know what went wrong.
2) Add a button to ping the search engines manually - I generate a few sitemaps and then upload them after manually fiddling with some of the weighting values and then have to run the generate process again just to ping the search engines.
3) Add an option to refresh the crawler page every x seconds to report back the progress of the sitemap generation. This will also fix the many timeout errors people are experiencing (I can't change php.ini as I'm in a shared hosting environment on IIS).