PoR/RD had the worst supports/endings ever. Only about a handful of people had support endings, and in one of those two, there weren`t even support conversations.
I like this system, and I`d like to see it more in-depth in future games. The support endings were some of my favorite parts of the GBA games.
It would take a lot of work, but it would be cool if you could choose between a "friend" set of supports between two characters, and another one that would lead more to a romance. You could have an unlimited amount of "friend" supports, but only one person in a relationship at a time( IE if they die, you can pick someone else).