Theming Plus Preventing Multiple Vote Casting

I just installed decisions and i'm trying to do two a couple of things with it and was wondering if you might be able to help:

1) Is there a way to retheme the decision blocks. i'd like to clean them up a bit. how would i go about doing that - could i override a theme function - if so which one?

2) is it possible to automatically disable the view of the block once a vote has been cast?

3) what page view paths are defined to look at the results of existing polls outside of what is provided in the blocks?

4) What technique do you use to prevent a user from casting multiple votes (to skew results)?

I've got drupal installed on my local system. I'm logged in as root and can only cast one vote. However, when i log out, i should be the anonymous user but i'm still not allowed to vote (or maybe i did in another session and it is tracking that ).

Every time i close mozilla, i clear out the cache and cookies. So there should be no cookies to track a session. So how does the module know how to prevent me from casting multiple votes? (e.g. what method do you use)

I want to know because I want to make sure i configure this correctly when the site goes live. but more importantly, while i'm testing my site locally, i want to be able to cast multiple votes to see how the module calculates it's results for different types of polls/surveys, etc. Because i'm only allowed to vote once, i can't get a real feel for how this will work in the field.

thanks for any help you can provide