Sikuli does not seem to know the difference between the image of an 'e' and an 'o'.

Hi,

I am trying to enter a line of text via clicks on an onscreen keyboard, into the text box of said keyboard, that contains an 'e'. Sikuli clicks on the 'o' key instead. We are looking at using this to test a cutting edge application. We have our own image compare algorithms that we can tune to handle this kind of a comparison properly. So I have three questions:

1. Does Sikuli have a tunable mechanism to eliminate such false positives?
2. Does Sikuli give access to it's image region comparison algorithm's for the verification part of the testing procedure?

Thanks kind folks!