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I haven't noticed any problems with NAF; all the created artifacts work normally. And regarding balance – there isn't any in this game :) Moreover, improving artifacts will be a challenging task.
Regarding mechanics – "advanced" compatibility with NCF; the script can determine which specific creatures are installed in the game and use them. Currently, it's possible to recognize the presence of 4 creature upgrades in the game. If these upgrades are present, they will appear in the armies of enemy heroes, scripted battles, guards, etc.
UPD. If there's someone willing to help with the graphical aspects (new icons, maybe some models), please write to me in a private message!