Check with Support, but I believe re-running the importer is supposed to do the right thing and grab the new comments. There's someone on my flist apparently doing this periodically, instead of crossposting.
ETA, sorry I missed your comment above about checking previously re crossposts. Might still be worth a check to see if they changed that functionality, as DW is under pretty active development.
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ETA, sorry I missed your comment above about checking previously re crossposts. Might still be worth a check to see if they changed that functionality, as DW is under pretty active development.