Staying within FCPX, you can only 'gather up and copy media' which isn't ideal. At the recent Faster Together stage at NAB, Chris Steele from Marquis Broadcast demonstrated Worx4 X that copies and trims media saving a lot of disk space.
Subtitles, love them or hate them, they are an essential part of constructing a programme for domestic or international distribution. Jan Willem den Bok has written a plugin that speeds up the process of building subtitles in a show on an FCPX timeline.
We always like to help the smaller plugin producer and this is no exception. Trevor Davies or as you might know him better, VFX Nut has a bumper pack of plugins on offer.