First of all, thanks to Argonius for this plugin.
I've found a little glitch on the login page, when you use a custom login logo: the image is setted as background, but the "repeat" css value is not set so it takes the default, i.e. "repeat" and you can see the logo partially repeated.
To fix this "problem", just go to plugin.php, on line #1269 and sobsitute this
jQuery("#login h1 a").css("background", $url);
jQuery("#login h1 a").css("background", $url+' no-repeat');
Hope to see this patched in a future release.