You guys are more like the 100th, 101st, and 102nd requestors of that feature. Unfortunately, we don't have the source to buildos and all requests to get it so far have failed. The developer's name is bepe and he is a user at xda-developers. He is in germany and like many europeans takes a long vacation this time of year.
You would be better off perhaps developing a separate app that presents the list of checkboxes and modifies each option.xml. Then, when you run buildos everything you want is preselected. Kludgy but I think that's the best you're going to be able to do for now.