Good idea, improvable: Rated 4 out of 5 stars

The idea is good unfortunatly it still breaks depending on the skin. If its just for the purpose of displaying non-unified histories a slightly more lazy approach might wield better results: Simply clip the original Unified button on the right hand side and then only supply the drop down markers. An option for the amount of pixels to clip and voila full theme compatibility.

This review is for a previous version of the add-on (1.1.1).