JiffyPopTart
Bree-Yark
1) I'm sure there are lots of people who can play dragonborn as a social creatures but I can't really seem to. I tried, but they just seemed too monstrous to really fit in to really make the "epic romance" style fantasy work. The shifters and the half-orcs work for me because they are human with a little bit of monstrous edge, while the dragonborn are monsters that walk like humans. So I feel the "Mos Eisley" problem that the OP referred to, that they work well as an exotic rarity at a cosmopolitan Astral Sea port, but not as your local constable.
Does everyone in your game have a romantic subplot? Wouldn't it be possible to have some other sort of subplot wrapped around a dragonborn? Heck, even the "Everyone on the planet finds your kind really weird and doesn't like to be around you" can make for an interesting subplot when roleplayed.
I ran a Shadowrun campaign for a brief while back in its 1e days, and a player made an Ork. I really roleplayed the "people don't like or trust orks" aspect of them and it ended up making the character way more interesting than if I had just treated him as the gruff silent dwarf sitting in the corner of the bar.
DS