More like decisions in the story, and interacting with characters
http://www.rebornevo.com/forum/index.php?/topic/23106-spoilersrelationship-variable-guide/#comment-586259
@MarcusBalearius
Certain actions that you make in the game will add reputation points to your reputation with characters, changing how the game goes. I'll edit in a link in a moment.
Everything you've done on the community release carries over. So if you've completed the storyline and sidequests in the community release, they will be completed in the public release, as both use the same save file. The community release is just a further debugged version of the public release.
Well, if you didn't know, the shiny rate in reborn is much higher than in the regular games.
I spent six hours breeding abras, and got about six shinies.
It would be possible to create something like that, it would just take a bit more effort.
I'm pretty sure that this is not possible. I think that the factors for shinyness are randomly generateed for each mon, taking very little from their parents (in reborn)