->I would make the First Age at least twice as long as it is now and start 5 additional battles 馃檪 if I were selfish 馃槢
but if it's for the good of Middle-earth 馃槚hifty: I'd either let Sauron rule NW-M-E in the Third Age (just imagine - that would avoid all battles and enable the peoples to live in peace as long as they follow Sauron's commands 馃槢 ) or errh try not to let Feanor's sons swear their oath
The problem is that changing things always ruins the best stories 馃檮
So better not change anything 馃槃