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From Philip Chan's blog:
The concept is simple, I make a Generic family (it can be any category actually) as a solid (in this case, just a simple extrusion), let the family intercept the curtain wall, then use "Cut Geometry" to cut out the curtain panel.

Once I made all the cut in the curtain wall, I have a yes/no parameter to control the visibility of the solid so that I can "turn off" the solid. As a result, it would appear that the curtain wall is cut out by a void. The good news is you can use the same family to make multiple cuts and it will work on the mullions as well.

Read more:
http://phil-osophyinbim.blogspot.co.uk/2013/08/curtain-wall-and-engraving.html

Another nice workaround by Philip Chan - if you want to change one of Revit's built-in Type Parameters (derived from a Family Template, such as Door Fire Rating) to an Instance Parameter, you just have to take the Family on a little round trip to a more flexible Family Category.

For example:

1. New Door based on Door Family Template
2. Switch to Generic Model Type
3. Change built-in Type Parameter for Fire Rating to Instance
4. Switch back to Door Category

You can read Philip's whole post at:
Phil-osophy in BIM: Hacking System Parameters in Door Family