TinyMCE font sizes in Plone 4

Hi!

Is there a simple way to add font sizes option to TinyMCE editor in Plone 4?

In terms of different sizes I have only the options set here (I think): https://github.com/plone/Products.TinyMCE/blob/master/Products/TinyMCE/profiles/default/tinymce.xml#L38

I'm not sure it's a good idea (in terms of design consistency), but it is a request from a client.
Do you have a solution for this?

Thanks.