Highlight Tool

Is there a Highlight Tool like the one in Preview that turns the courser into a highlighter?

I found the way by selecting text and then pushing command+shift+L (or the one via the format menu) but is there an easier way?

As in most OS X applications, either control-click or right-click any toolbar and choose Customize Toolbar…, or choose View > Customize Toolbar…. Then, drag either of the icons shown in the image to the toolbar:

The tool on the left uses the highlight color chosen in Format > Highlight Color. The tool on the right can be used to set that color and highlight.