Is there a way to add an icon to the powerclip toolbar?

I don't know about adding a command to an existing menu, but, you can learn a keyboard shortcut, which in a sense, can do what you may not be able to do to the existing power clip menu. If you can find the command you want in Customization, where you could drag out an icon onto an existing toolbar or one of your own making, you can, in the same place, assign a keyboard shortcut. This way you can use this command outside of the power clip scenario also.

Now the one to ask if it can be done is Jeff Harrison. If it already can be done and you don't mind spending for it, he has a website:
macromonster.com.

He always has some freebies or tips on CorelDraw. The other place with helpful info I like is unleash.com.