The TJL is prepared by Galaxie Software, and yes, we are due to update it by adding more years of journals, but the choice of journals is theirs.
We ourselves have added the Biblical Archaeology Review (also due to be updated), and the JBL from SBL. Our journals are listed here.
These journals are probably the most difficult kind of module that we have to prepare: massive amounts of material, varied electronic formats over the years, and multiple authors who usually do not exactly follow the journal guidelines (which changed over the years). To display all the text and images correctly, and accurately assign the transliteration, Biblical references, other cross references, and footnotes to their fields (layers), can be extraordinarily difficult.