Are you only using the "+" button in the bottom right corner of your contacts list for adding new contacts in Wave? As with everything else on Wave there are several methods of doing the same operation.

• In the contacts list you can also just search for a Wave adress and this will give you the opertunity to click on a "Add to contacts" button as shown in the screen capture.
• In every wave you visit you can click on a participant and then choose the "Add to contacts" button.