1: Paragraphs are your friend, use that enter key to make it actually readable.
2: no to the dragonborn race, first some native races to eberron if you would (shifter/gnome)
3: stats: so from +2 charisma, you get to -2, under the assumptions that dragons don't get along with people? and what about velah walking through stormreach, what about the innate shapechange ability all dragons have, allowing them to live amidst the other races for decades, as many in lore are revealed to do. IF it would get stat changes I'd either go +2str/+2cha/-4dex, OR +2str/-2 dex
4: HELL NO to your enhancement/racial feature suggestions, since, as I read it you're wanting to give
- Tiering element touch to elemental burst to ALL weapons
- Tiered Dragon bane bonusses
- 3 tiers of power attack
- 2 tiers of str
- stacking +15% elemental damage of their favored element
- 3 toughness enhancements
- elemental resistances
- Damaging elemental cone effect
Which is just a no in so many ways.
1: Elemental damage to all weapons, really? adding ~3-4 damage per swing from this alone.
2: Dragon bane boni on top of that? adding another ~14-15 damage per swing against Velah
3: 3 tier power attack, I can actually see this if they get strength as a 'main' stat
4: 2 tiers of strength, same, can see this is strength is the main stat
5: 3 tiers of toughness. The only races having more then 2 tiers have con as an available enhancement stat (wf/dwarf/human/h.efl)
6: elemental resistances: no other race gets it
7: damaging cone: meh, can live with this as long as it's weak and/or extremely limited in use
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what, in my view, would happen if this was released:
1. H.orc becomes useless, everything it does can be done better by the dragonborn
2. Warforged becomes pretty much useless except for caster builds, melee is just outshined to much by the dragonborn to be even remotely viable
3. Halflings go extinct, since they're crunchy and taste good with ketchup
4. lots and lots and lots of [insert element] dragonborn [insert same element] savant sorcerer will rise
5. The game might as well be renamed Dragonborns and drow online