actually I think Looloo is looking for a feature similar to the 'film strip' output option that Premiere has. this is not a sequence of still image files, but a single file with all the stills in a line in one big image file. this is useful for doing special effects. the files open up in Photoshop. you can edit them and then bring them back into premiere as a video.
there is no such option in Vegas. you could save your footage out as DV or as uncompressed video and then use Premiere to convert to the Film Strip.
I asked once and somebody told me to use Viscosity for "rotoscopy" (wich was my question at the time...).
But... how does it proceed with Viscosity? Anybody knows?