So, how can I make the change once to a DCT ? In unix I could make a symbolic link. DOn't think that is an option.
inline tad in the DCT will do the magic. - Create a master a configuration that contains the list of DCT elements defiend globally.- In each individual DCT using the inline script to read the master DCT to populated the elements.Similarly you can use iw_include tag in the TPL's.