Adding the ability to trigger an event from an IX chain to call another external IX event would build a robust and dynamic sequencing for incredibly scaleable and approachable sequencing engine. I can list some examples if you need further input into what it would enable. It would be a super accessible version of what Greensock's tweenMax can accomplish - crazy powerful stuff.
Calling events like scroll to anchor would enable the snap to functionality everyone is clamoring for with better implementation and greater flexibility than anything I have seen on the web as a closed system scroll hack. It could be added to scroll IX and add amazing functionality with the scroll range offsets already in place. I think you just need the scrollto anchor event call
if anchor is within range of scroll offsets > activate scroll to with the easing of your choice. The best part is it would work with a full height page layout or to snap to any anchor point anywhere on a single page site regardless of spacing. Even as an event when an expanding panel opens to align that section into view. it would be the ultimate in flexibility and ease of use.