Whoe else would like to have sub races, like in Dragon Age Origins where you could choose between city elves ad dalish elves. It would also add some lore to the other races other than the Nords for Skyrim, It could change others disposition towards you and *fingers crossed* provide slightly different starts, or maybe just starting dialogue (like Valen Dreth but more dialogue, one for each race, subrace and gender)
For example,
Khajitt: Ohmes, Ohmes-raht, Suthay, Suthay-raht, Cathay, Cathay-raht, Tojay, Tojay-raht, Alfiq, Alfiq-raht, Dagi, Dagi-raht, Pahmar, Pahmar-raht, Senche, Senche-raht, Mane (Not all of them as some aren't even specified in lore but it would be nice)
Argonian: Agacephs, Archeins, Paatru, Sarpa
Dunmer: Hlaalu, Redoran, Telvanni, Dres, Indoril (Not strictly speaking 'races') or Vvardenfell Dunmer, Mainlander
Altmer: Maybe, Summerset Isle Altmer, Offshore Altmer, or Altmer who follow the rigid old ways and the new wave thinkers could be a 'subrace'
Bosmer: Different Bosmer for different parts of Valenwood for example, Tribal Bosmer from deeper in the forest and City Bosmer (hehe)
Orcs: Orsinium Orc (liked by orcs), Wild orc (recently civilised orc, deeply respected by orcs, feared by other races), City Orc (Orc not from Orsinium or the wilds)
Breton: Half elf Breton, Quarter Elf Breton (with more combat skill to Quarter and more Magic skills to half)
Imperial: Cyrodillic Imperial (has better relations with Imperials), Provincial Imperial (has better relations with other races)
Nord: Sub-races based on different ares of Skyrim, makes them more/less liked in different ares
Redguard: Desert folk (weaker to frosm stronger to fire), ???

I think that choosing races in Oblivion was kind of irrelevant as Argonians were the only ones with a real advantage. Feel free to suggest Subraces or buffs/bonuses for subraces