Is there a way to set the url value and not load it automatically when using the datatable widget?
Maybe store it in some custom config property (a property that does not exist in datatable config)? Then when you need to load data from that url you can refer to it (e.g. grid.load(grid.config.dataPath) where dataPath is the property that stores that url.
Though I am curious about the scenario for which you need this url to be stored on the widget but not used for loading.