That can be done . Cose from what I could see (During the vid with female Human Inquistor)..they are using the same old wheel for dialogue .
I believe it can be done , the difference is that instead of giving us 1 heart (like in DA2) for flirt options...we could get 2 or maybe 3 . I think in DAO ....i felt I had more choices with Alistair during the romance then Leliana . With leliana was hit on her , she confess , get akward and cute...then bedroll .
Alistair at some point , I could be nice and gentle...or be army girl and tell him to get it on with and he litteraly melt right there in front of you 
So this said...hopefully when a romance is initiated , we could get maybe 3 tones of voices : kinda like in Mass effect wheel .
1-Paragon
2-neutral
3-Renegade
So if romance....it should be like this:
1-Shy and akward (merill)
2-Normal and mature (Aveline though she was more oblivious)
3-flirty and forward (Bela/zevran)
or maybe..we get more. Im hoping for more..cose that wheel is round...and round....so it could get many trees stuck to it 