Well, that is need consideration.

The ccenter use with d3forum comment system, will be conflict access control. These modules very different in basic access models.

Because d3forum message mostly in public, other hand ccenter message mostly in private. Of cause, probably can use d3forum comment system, but that will need very carefully setup.

So, I not recommend using d3forum comment system to ccenter.

Is it possible to integrate coments with d3forum?
Perhaps, it would be interesting to add this option in the preferences. In some cases this option can be useful.

Thanks