Yes, I have the rpencil-text background in use in a few other elements, which is planned. None of those you listed should be effecting the H1, H2 text on the slideshow of the featured slider when I apply the image to the .site-header element.
What I need is for the theme authors to identify the element that is linked to the site-header causing it to be inherited to the H1, H2 elements so I can be more specific in the CSS than what CSS Hero is allowing.