When it was in, the import feature was able to load in saved costumes from the in-game tailor, however if those costumes used items that had not been hooked up for Foundry use, it replaced them with another costume piece.
If you mean, has it returned since they pulled the feature, no. To answer the other part of your question, when the costume import feature was available, it could import player captain/BO saved costumes, but many of the costume options were unavailable.
As it stands now, if you want to include your captain in your Foundry mission, you'll need to recreate him.
Comments
I'm not sure if it allows you to copy your holodeck characters in but I wouldn't see why not
Foundry Mission Database
Check out my Foundry missions:
Standalone - The Great Escape - The Galaxy's Fair - Purity I: Of Denial - Return to Oblivion
Untitled Series - Duritanium Man - The Improbable Bulk - Commander Rihan
There has been no word on it being put back in.
As it stands now, if you want to include your captain in your Foundry mission, you'll need to recreate him.
Me playing UT2k4 (red guy) - http://www.youtube.com/watch?v=Wz0DnP7wXnU