So it was about half way to the point where I am now when I enabled the option "also add characters when adding words" and I really like it. I was wondering if there was some easy way to get skritter to add all of the single characters that I have never studied on their own, not just the ones that I encounter past the point of enabling that option.

I guess one way would be to just add one of the most common single character lists. I'll probably just do that.

You can set all your lists to the beginning of their first sections and add through them again. When Skritter adds, it'll fill in the missing single characters. That'll probably do better than using the frequency lists.