Adding either sortable or draggable to a tabs widget disables the keyboard functionality. This is easy to see using the example of tabs with sortable  on the jQueryUI site. You can't use the keyboard to move between tabs and all accessibility is disabled. It's easy to modify this example to show that the same phenomena occurs for draggable.

I understand that sortable and draggable are not considered accessible and have no keyboard controls. However, I should be able to add them to a tabs widget without defeating the keyboard controls that are there normally. I currently can't add sortable as an option for sighted users without killing any functionality for screenreader users. 

I attempted to post this to the bug database, but it rejected my post as "spam".