>Is there any way of changing a field's DefaultValue programmatically? Some our clients want to default certain fields differently and I'd like to do it through the DBC. Any ideas?

I would have a table of all the fields and their default values. Then, in the default value, try putting a function call (UDF, Stored Procedure, or just a Lookup() call) in there that goes and looks for the field in the table and returns the specified default value (of course you'll need to make the types match).