There hasn't been official EA patch for Live 08 I think.
Unability to move a player to rebound missed free throw is a bug of the game. It's not possible to fix. Only thing you can do is to switch to other player, if your center/power forward is controlled by the cpu, he will automatically try to rebound.
In which way you'd like to edit the national teams? If it's the roster, you can edit it by dbf files.
Hotspots - yeah, it's possible to edit. Just save your roster, exit the game, then go to this location:
My Documents -> NBA Live 08 -> saves -> [your saved roster name]
Edit players.dbf file with DB Commander and the hotspots fields are nearly furthest to the right. All the info about editing it you can find
here.