Thank you for taking note!
I understand your last point especially on the generics. But because the tool picks ups the title in random, the desired spread of percentage might also Slightly differ from the objective of user. From my example above, random pick of title could result to keywords appearing 7, 8, 9, or 10 times (more than the desired 30%) or perhaps, just 2 or 3 times (less than). It could be a bit hard for a user to study and experiment the best anchor text spread for his/her site.
Just suggesting because I've had experienced very good results when I implemented it. It also allowed my sites to recover from the effects of Google updates especially Penguin.
Thank you very much! I know you will look into it.