FormBuilder and frozen dates

There are two issues with frozen dates, I wonder if other people have found the same problem. Maybe I should be doing something I'm not?? 1. If I use the $fb_userEditableFields array and I exclude a date field from the list (ie I want it frozen) the date field is never frozen. 2. If the date in the DB is NULL the date always defaults to today's date. This may be ok for editable dates but should not happen for frozen dates. The problem is that in the function _date2array, if the date passed to it is null it will return today's date. Another question which may be related to DB_DO, is there a way I can prevent certain fields from being updated when the form is submitted. I don't want my frozen fields to be sent to the DB as they may overwrite new values. Thanks, Etienne.