If you need support from Yola please contact us via firstname.lastname@example.org or make use of our live chat service! We are working on a new approach to community-based support and during this transition period we are not adding any new threads to this forum. Many thanks to everyone who has participated over the years and we look forward to unveiling a new peer-to-peer support system soon!
From March 2011, you will be able to customize the CSS of your Yola site, if you have a Yola Silver package. I think this might offer you the customization freedom you are looking for. Here's some more information about Yola Silver: http://www.yola.com/pricing.
I hope that goes some way toward answering your question.