To load other peoples item.dat and textures there are some new commands in 3.2
You can try the following:
/loadplayer 0 hampa
/loadplayer 0 bummap
/loadplayer 0 trailman
/loadplayer 0 texman
This assumes you have those accounts in your custom folder.
The 0 or 1 is for player1 or 2.
This command does not work online.