A few Chromakeying questions...
 

Using the Vegas Chromakeyer, how do I select multiple points with the eydropper? Holding CTRL doesn't seem to work.

Can you apply more than one instance to the same event?

Unfortunately you can't.
Hold the mouse and drag it across a small area of your CK background.
If you're using Vegas Pro 9, you no longer see the rectangle but it still works.
Just make sure to stick to the CK area and nothing else.

My first thought was no but I tried it and the answer is yes.
I'm curious as to why you would want to do this though.
If you have some garbage you're trying to get rid of, bezier mask(s) do the trick for me.

Mike, I was considering multiple CKs as a workaround to not selecting multiple points. Thanks for the info.