[oXygen-user] Distributing Dita filters in Oxygen 15.2

Hi, We use Oxygen 15.2 and distribute dita filters via the default-options.xml file to our writers (using the global option). But whenever there is an update to this file and the file is imported by our writers, it wipes out the writers preset options. Is there any way of retaining the authoring presets of the writers while allowing for us to keep distributing our dita filters this way? It would be great if there is a default-options.xml file where we have the filtering options and then a user-options.xml which can override some of the default options. Any help would be greatly appreciated. Thanks! Nathan