This is a simple mod that replaces the eye of ender in the End Crystal recipe with a nether star. And makes the dragon drop an egg every time you kill it.
Both of these are configurable if you only want 1 or the other.
Note the dragon egg will spawn next to the portal because the portal itself and anything on it gets reset when the dragon dies.
You are free to use this mod in any mod packs and you do not need to ask permission.
Note if you have Draconic Evolution installed you do not need this mod because DE has this functionality built in.
If anyone has any ideas for other dragon related tweaks feel free to leave a comment.