Font sizes in text editor

There is a drop down menu for formatting font size and you can choose from predefined values. But for example you can’t choose font 60, you can choose 48 or 70. Now I know it is easy to correct it into wanted font size if you view source code, but some of my users don’t know and don’t need to know HTML, and also they have to make changes of this type almost every day. If they could type the font size it would help.