Yeah, I'd like more planets as well. And it would be nice if you wouldn't have to find 4 star maps on 4 set planets or 4 jedis on 4 set planets. How about they make the locations of whatever you have to find random? Like the Calo Nord/Darth Bandon encounters in the first game...
If the objective is to find 4 different persons/objects/whatever, they could have 8 planets where 4 of them would be randomly chosen at the beginning of each game... would also do wonders for replayability.
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It maybe difficult to write a believable story to make that work. It would have to be a person, it could work but the mechanics would be interesting.