Comment on WP Autoblog Plugin Support by SEO Dave.
Since a new version of the theme (Stallion 6) is in the works and it’s a major upgrade (rewrote most of the code) I wouldn’t advise making the changes yet.
In Stallion 6 it’s possible to add a custom header image which could be a logo. Take a look at the Stallion SEO Ad Theme website.
Currently running a header image with a picture of cheetahs. You could incorporate a logo into a header image (dimensions 1000px by 130px or 150px), all depends on what you are trying to achieve.
Stallion 6 should be released by the end of this month and Talian 3, 4 and 5 customers receive a free upgrade.