Settings insets for toolbars in a Synth theme has no effect:

<style id="mainFrameToolBaPanel">
  <insets top="14" left="14" bottom="14" right="14"/>
  <imagePainter method="toolBarBorder" path="border2.png"
    sourceInsets="6 6 6 6" paintCenter="false" stretch="true"/>
</style>
<bind style="mainFrameToolBaPanel" type="name" key="MainFrameToolBar"/>