Thank you very much for your Feedback!
Right now, you can define rules to add static texts, so you can define in the backend the twitter handles for each author.
Until now, we haven't implemented user-level features, to include author twitter handles in the Posts; but we are already developing the upcoming product iteration with frontend features.
You can actually skin the comments box on your site using CSS. Disqus has an extensive walk-through on how to achieve that here: http://help.disqus.com/customer/portal/articles/545277-disqus-appearance-tweaks
This extension does everything I need and best of all it was free. I don't know how good the support is because I've never needed to get in touch with support as the product just works.
The user interface is quite good and overall it is a very simple extension to install and use even if you an amateur.
Sadly things started to go wrong and it seemed a little buggy. At first the support was quite good but I got the impression as time went on that the problems the extension was displaying was too much "hassle" for the developer to fix and my problems were ignored as "low priority".
Communicating with the developer proved to be a complete nightmare. It was very rare to get support during normal working hours and it was common to have support queries ignored for weeks on end and then dismissed when finally they were looked at.
The product itself is simple to install use however continued use of the product is extremely difficult when things go wrong.
If you wish to purchase this product then you could do a lot worse as the product itself is reasonably good however if you are not capable of building such a product from scratch yourself you may find, as I have, this product to be a waste of money as the level and quality of support is not commensurate with the eagerness to sell the product.