+1.
If we don’t have it yet it’s certainly because of implementation impossibility in the actual audio engine (and the amount of testing necessary).
Hopefully Nuendo 7 audio engine will be modified to accept this. 
It’s available in Samplitude since about 15 years.
For EQ filters it would be nice to have settable filter slopes as well, and filter integration in the EQ graph. To keep compatibility with older filters, just add a few new EQ bands and allow to set a couple of them as low and high pass filters.