Actually, when you chose them from Effect menu, you can click as many as you want, just as you described, but that is before chosing the coordinates manualy. You can rotate them around with click and hold - you'll see the effect and be able to position them close to what you want. When clicking like this, they will stay in same hight and direction but you can type in coordinates for each after placing them, or use positioning tool to move and rotate them around. Getting them in perfect spots takes time, but keep in mind that there can be too much waves so check it in EiG often.
This is same for all objects you place in CAW.
Also, try right click on the name of the effect in a layer - you should be able to copy it but I'm not shore about this one).