Hello,
this aim requires actually some portion of customization, so please feel free to customize the Scrolling News/text webpart. Well, firstly
clone it to prevent any upgrading issues. You can find its code-behind here:
~\CMSWebParts\Viewers\Effects\ScrollingText.ascx.cs - you'll need to amend the HTML code and javascripts used in there.
On the other hand, you can try to integrate some jQuery third party script to do the slider job. Personalyl, I find useful the following one:
http://css-tricks.com/anythingslider-jquery-plugin/.
Best regards
Ondrej Vasil