I know this post is a year old, but I did some testing and figured out how to do outlines with the dynamic text, and I figured I'd drop it here in case anyone else needs help with it.
I changed the default style to this:
style default:
outlines [ (absolute(4), "#00000000", absolute(0), absolute(0)) ]
This makes all text have a transparent background, you can then use {outlinecolor=#000000} text {/outlinecolor} with the kinetic tag in order to give that text a black outline in this case.