Hi there win7user2010, and a Big Welcome to the Seven Forums. . .
Now to your problem, and the answer is "YES you can," albeit it is a little bit of work, and it can only be added to the "Quick Access Toolbar." That is the Toolbar located at the very top left corner of your screen. Just go into "Options" and go to "Customize." From there go into "Choose Commands From." Then just click on the commend you want to add the "Quick Access Toolbar," then click on "Add." You have now added a command Icon to the bar.
The Quick Access Toolbar can be moved to the bottom of the ribbon by clicking on the down arrow to the right of the last command button if you are looking for easier access to the Quick Access Toolbar.
You can also create your own ribbon, just read up on that in the help files.
Hope this helps, and good luck.