Regarding combat it would be great to find sometimes new enemies in cleared places. It would improve the game and it would be not so boring to go to known places again. If you could find a good balance, so not to often do this, it would be fun. As much as I remember the enemies won't level with characters, it would be also cool 1-2 times to find hard units suddenly... ;-)
It would be also good to make some main or optional story lines to go back to places where we should find things which were not important first time.
