I would print a booklet with trap of 3mm. With the current version 2011.05.18 18:04 MKIV – luatex 0.70, all's right. But with the current version 2012.05.30 11:26 MKIV – luatex 0.72 and the actuel beta – luatex 0.74, the header logo is cut into the cut marks (w/o trap).
You can see my minimal in attachment.
PS: excuse me for my approximate language, I don't speak english…