Mercule
Adventurer
How about this: Aside from the fact that I have an established setting that really doesn't have anywhere the dragonborn could have been hiding for the last 2000 years, I don't like PCs with breath weapons.Technically, I said that hating dragonborn so much that including them in a campaign would ruin your enjoyment of DMing the campaign might be an indication of a personal problem you should sort out on your own rather than inflict upon your friends. You added a lot of the rest.
If a player can come up with a suitable replacement ability, I'd consider finding a place for a dragonborn character. I might also recommend playing a hobgoblin, as one nation of hobgoblins IMC has a very similar back story (honorable, collapsed empire; desert-dwelling; warriors) to the dragonborn.
I also don't allow dragon shamans (from 3.5 PHB2) because I don't like PCs with breath weapons. I might, if I were running Eberron, but they don't fit the flavor of my home brew setting (which, oddly enough, reflects my general preferences in fantasy).
Am I a nutter or not?