We looked into this and it looks like the Helper.Static tags on the touch attack / ranged touch attack are what's stopping them from appearing in the list? In our data files, we've only ever used those tags on things that should never be added to the hero, like wRay and wTouch. Our intent has always been that anything with those tags would never be added by users, but we may have only implemented that recently.
If you want the touch attacks to be selectable like any normal weapon, I think the right thing to do would just be to remove those tags from them? Were you trying to do anything specific with those tags, or did you pick them up just by copying wRay / wTouch to create your touch attacks?
Hope this helps!