Not sure what you are trying to do here? Why would you want to edit Aftertouch?
You can use aftertouch (as you can with most continuous controllers) to modulate pretty much any setting in Omnisphere, as you can with the modwheel etc etc. Just follow the standard process for assigning aftertouch to control one or more omnisphere parameters.
I guess what through me off was that when I started editing a patch it did not have any noticeable aftertouch, but while messing with it I did start to notice it was there. Are some of the standard patches designed with aftertouch and maybe I just hit the right settings to trigger them? By the way when I noticed the aftertouch there were no settings made assigned to aftertouch.
I know there are all sorts of ways to do aftertouch in Omni and in Logic, just found it wierd that I started hearing it out of the blue. I guess I have just been spoiled by my Triton with all the aftertouch controls