User Toolbars - adjustable height of the title

The title areas of the user toolbar groups have a fixed height. Would it be possible to make this height flexible? The reason is that the font is variable in size. And when i choose a bigger font then i may need a bigger area. And with the smallest font i may need a smaller area than the current size. And without text it may even be enough to have four or five pixels to click at for expanding and collapsing the toolbars.