VASTLY. When I modded BFME, I didn't realize how spoiled I was, even though the community always wanted more tools. Of course I did too, especially when BFME II came out and half of the models/animations started using a different type of W3D Shader and we couldn't mod them using existing tools...How important do you feel official support is for modding games?
However that is NOTHING compared to the nightmare I have experienced when modding BF 2142. Apparently EA/DICE intended on releasing an editor... but when they looked at the the editor they were using they realized that it exposed too much of the games source code so they scrapped mod support altogether. The existing mods are running off of the BF2 editor which sortof works...
Compare the two modding communities: C&C vs BF. Because of the support shown for modders for the C&C Series, the modding community is still vagrant and thriving. Because of the lack of support shown for the battlefield series, the modding community is limited to one forum with MAYBE 5 active members. . .
All in all, I believe that support is a necessary ingredient to keep a game alive.
BTW, my favorite modding tool is Notepad++