I was expecting to see this request here, but to my surprise, there none!
With the interesting RP dialogs that party members sometimes have, it felt like the romance option was missing. The traits like romantic, heartless etc are perfect for some kind of a romance system. I believe that it ads much more depth to your party, and enriches the RP even further. I remember when I was playing Dragon Age: Origins, the combat and skill system was so boring, but the dialogs, story... and the romance is what kept me playing for days. I wanted to know how the forbidden love my party members had was going to end up. The characters felt much more alive.
I prefer a romance system based on the character traits, and one that does not affect the gameplay in any way. Of course, any other suggestions are welcome. I wonder what Larian thinks about this.