I've just upgraded to ACA 2012. I can see how to insert a door in either an offset "or" centered position, but not both. In my previous version, the position could be set to "center / offset" which was an "and / or" option depending on the cursor location. Is this option available in ACA 2012?
No, this changed in ACA 2011, as part of an expansion of the options when inserting a opening (Door, Window, Door/Window Assembly, Opening). If you are interested in more details, I wrote a series of blog articles on the change. Here is a link to the first article; there are links to the next article at the end of all but the last article.