I have been looking for a solution for sometime now. Have not found any one yet... All we all know every page should have only one H1 tag, however it is not known for most of the non tech editor. I want to restrict the heading option. So there will be no confusion. Better yet, if we can change the label to L, M, S for H2 H3 H4. It will make more sense. one article should not have more than 2 sizes of heading in fact.