That is the engine problem, and without making major changes it's not possible to fulfill the requirement.
The problem is that, any major change of the core mechanics may - or I should sys - is 100% percent - cause kinds of bugs, including crashes and black screens and anything you can imagine and anything you can't imagine.
So the consequence will be one of the two followed:
- the devs are busying fixing bugs, and a hoard of guys yield in the forum why they can not have the release to play, and they will not play anymore until all the contents are released;
- the devs heard the voices and send out the pre-release version, and a hoard of guys yield in the forum why there are so many bugs, and they will not play anymore until all the bugs are fixed.
I don't like any of the two situations, so the current situation is best for me, though obviously not good.