First of all may I congratulate you on what looks to be an absolute gem of a plugin!
I have recently installed it to my Russian website http://ucheba.co.uk
and it appears that the program treats all cyrillic alphabet letters as different entities, which really messes with my OCD when analysing on page SEO. the program would missreport the in page keyword count, because the first letter of the SEO keyword phrase is capitalised and the keywords in page are not. If I switch it to lower case then the program tells me that the title contains no keyword phrases and so on.
I understand that it still means that the page is properly optimised, however not being able to get a green light for a page is really quite annoying as it's probably the single best fautre of the plugin.
Once again, you are doing a fantastic job, but I fell by ironing out this particular bug, you would immediately open your plugin to a much wider market in one fell swoop!