Well, I spent the last few hours looking at this bug. I think I've identified two issues which are preventing the 1.1.5 tomahawk components from using AUTO_SCROLL on myfaces 1.1.4, and one of those issues also breaks AUTO_SCROLL for any core commandlinks that are in the same form.
I think this issue breaks auto scrolling for all components in the same form as a tomahawk commandLink, regardless of whether they are core or tomahawk components.
<input type="hidden" name="autoScroll" />
This hidden input is generated to support auto scrolling. In Myfaces 1.1.4, it is generated at the end of the form. In Myfaces/Tomahawk 1.1.5, it is generated just after the first commandLink. When you mix Myfaces 1.1.4 with Tomahawk 1.1.5, you get two of these inputs per form in any form containing a t:commandLink. Such forms have autoscroll broken for both core components and tomahawk components.