Override heading hierarchy and allow free use of headings

I would like to be able to select the heading level that I want - not be forced to accept the next level below the previous heading.

We have FAQ pages where we use headings for the questions, but these look huge because they are always <h2>. <h5> looks much better and is easier to read. We have to use headings because we need a ToC and the anchors. Writing this all manually in HTML is too much effort and not scalable.