I recently updated the SMD exporter in WW to accomodate the latest versions of Source. In the process I also update the standalone SMD Exporter in WW. Here is the new UI:
(https://www.wallworm.net/proxy.php?request=http%3A%2F%2Fdev.wallworm.com%2Fmedia%2F1%2Fimage%2Fpng%2Fpage%2F31_ww_smd_exporter_1.33.png&hash=4e687df495ac70b769c69cfcee664215a3c8a242)
The updated docs on the new UI and features are here (http://dev.wallworm.com/topic/57/smd_and_vta_exporter.html).
And for reference, you can use this SMD Exporter in 3ds Max 2013.