Remember the dragons I talked about in the old forum? If you want them to possibly be in the game, wouldn't the dragons feel more natural in the environment if they was there when you started to play the game? This could be one of the differences with it being a mod/plugin/add-on or a standard in-game creature/function. This is, of course, not only for the dragons, but for all the creature or function ideas on the forum. Maybe it's only I that think that way, but I have an idea.
And my idea is: let the gamers decide. The gamers on the forum(if there are any) could vote in some way when looking in these forums. Then, if many people likes an idea, we make it a standard in game creature/function. If there isn't many who likes it, we make it a mod. What about that?