Great plugin. I have an idea, which I would do if I was a coder:
A great feature would be to able to link agraphical image, such as a phone icon to a phone number. Perhaps having a shortcode such as:
[phonelink src="filename.jpg" number="00441234567890"]
Where src would be the graphical image to be displayed and number would be the phone number it dials out to.
Just an idea. :)