I used MDT to create my own deployment share, when you update the share, it creates its own custom windows pe iso/wim files so you can boot with your personalized settings or automate the process. I don't think zenworks lets you import these custom files into the Third Party Imaging Settings, at least I'm having trouble getting them to accept. Seems that it'll only accept the files that come with the MS ADK. This is a bummer, if true. Might have to ditch zen imaging and go with windows deployment server. :\

Not having much luck finding anyone who has experience with MDT/Zen