1st of all thanks for the plugin.
Yes I have one of these not all elements on https.
I think I have found a small problem.
When setting "Disable Automatic HTTPS" on.
The bloginfo and get_bloginfo commands are set to http.
Now this is partially right and partially wrong.
Because for example my Theme uses bloginfo's "stylesheet_url" which of course is a css file that should be vie https on an https page.
And also "template_directory".
And why is this partially right and I understand we can see it the other way - wpurl should be http and not https as this option is set.
So actually in this filter we should go more in dept and decide on each parameter separately.
I could be wrong, but that's my 2cents after debugging my own problem.
(if I am right and it is fixed maybe you will have less support tickets ;) )