I don't know any plugins with that specific feature, but I did want to mention this after reading your description. You can target specific pages/posts with CSS, so you can limit text wrap to your about page. You just need to know the page ID. WordPress includes a page specific class in the body tag. It looks like this page-id-123. 123 would be your page ID.
See screenshot - http://i.imgur.com/zFldy2T.png

So you can simply do something like this:

.page-id-123 .slideshow-class { ... }

This will limit your CSS changes to the slideshow on this particular page.