I dont like where the plugin puts its text
Take a look in the admin area of your forum - you can opt to have the plugin output its report of the number of votes of thanks and the voting link either before, or after, each post. You can also edit the text that is used by the plugin.
I dont like the margins and styling used by the plugin, can I change them?
Have at it! The plugin wraps its output in a div with a class of thanks-output - if you want to get into the code to really customize the output, look in thanks.php at the thanks_output() method.
Can I get a list of who said thanks for a post?
Yes - in the admin area, there is an option for listing all the "thanks" voters. By default the option is set to "no". If you want the plugin to list all the people, set that to "yes".