WordPress.org

How can I customize the RSS widget externally ?

You can use the super-rss-reader-widget class in your stylesheet to control the widget styling. Other classes are,

1. srr-tab-wrap - the tab's class.
2. srr-wrap - the wrapper of the widget.
3. srr-item.odd - to control the odd feed items.
4. srr-item.even - to control the even feed items.

Will the additional ticker effect slows the site ?

No. the additional effect needs only 3.4 Kb of additional file. I think thats not too heavy to slow down the site.

How to create a tabbed mode ?

Just enter the RSS feed URLs seperated by comma in the widget, the plugin automatically renders the tab.

For more FAQs just check out the official page.