For the DR1000, the best way I have found to interact with the current version of calibre is to disable the default DR1000 plugin and define the user defined plugin with the following:
USB vendor: 0x1e6b
USB product: 0x001
USB revision: 0x322
and then to use the following save template
{tags:'first_non_empty(
in_list($, ',', '^IREX$', '/Books/', ''), in_list($, ',', '^News$', '/News/', ''))'}{author_sort}-{title}
which ensures that the books with tag IREX go to the Books folder and news goes to the News folder,
(see also the discussion here
https://www.mobileread.com/forums/sho...d.php?t=151145 )