I don't particularly care much for lesbian/gay stuff, but the way BRS described them, it happens to be the way Bioware handles romantic subplots down to the letter. It also happens that the way Bioware handles romantic subplots is TERRIBLE.
Seems like what you want is to have gays/lesbians/transgenders in for the sake of having gays/lesbians/transgenders in and be able to say "oh gosh we are like, so progressive!"
Fire Emblem did homosexual supports fine with Ike and Soren already. It was well-written, it was touching, and most importantly, it was subtle. If I were to have my way, I'd make it so several characters had options to S- (or even just A-) support with both men and women, their sexuality ultimately depending on who they choose to S-rank, instead of being a constant, , blatant, pervasive part of their character.
Not that having blatantly gay people is bad, I agree with BRS that VC did it right with Jann (but only him, the lesbians were boring tripe), mostly because he was not just "that flaming gay", he was also a funny and charming character and also best girl.
That's my opinion, hopefully my low postcount and 4chan reaction image avatar won't make people disregard it before reading it.