Only for Sendy 1.1.9.5:
I have updated for Sendy 1.1.9.5 the mod I had proposed for Sendy 1.1.7.8 (last december) and Sendy 1.1.8.5 (in february): it allows to select the number of lines displayed in the "Last Opened" reports (instead of the default of 10).
Screenshot (above): http://dl.dropbox.com/u/406945/screenshot-sendy-1.1.9.5-report-hack.png
Download: http://dl.dropbox.com/u/406945/sendy-1.1.9.5-report-hack.zip (21 KB)
To install (Only for Sendy 1.1.9.5!!!): just replace report.php by this new one in your Sendy installation
Hope it can help!