Well, this is super hacky, but I tested it in the dashboard theme.
You can put styles into your "About" widget, and provided it's always open, they will be applied to your theme. I tested it with the following bit of code.
<style>
.lm_header .lm_tab .lm_title {
padding-top: 1px;
font-weight: bold;
}
</style>
You can probably style the about widget to a 0 height, and not have it show in your theme. No warranties expressed or implied.