Welcome to the project Raumhir. Do not fear that anythink in DoV is fixed already. The thinks nearly done as jet are very limited: FoG I would count as such and Ainulindale and Valaquenta. But the two later are still under discusssion.
And what ever you feel to need be discussed again (after reading the older discusssion) you should bring up (mostly it would be best placed in a new thread - which by the way anybody is fit to creat).
Respectfully
Findegil