In Timeslips addresses are "auto-filled" based on the settings in setup > general > new names. Address can be filled based on Template or Master. This has not changed. If you don't want to designate as Master and you don't have a template to use, you could import the address information in after you create the new matter. This is done by clicking on the import icon in the toolbar and choosing the fields you want to import and the matter you want to import from.