Is it possible to modify multiple keyframes on an effect timeline at once? I created a sequence of 20 or so keyframes. Afterwards I realized I wanted to make a slight change to them all (add a border around a cookie cutter circle), but I couldn't find a way to do it rather than deleting them all and starting over.

I was able to multi-select them with Ctrl key or the select-all from the menu, however modifying one of them didn't change the others.