You are not alone in wanting this feature since Cubase 4. I guess all owners of Virus TI wants this.
But it is probably never gonna happen in Cubase. 
In the mean time you can use the Virus TI as an Insert FX - but with the MAJOR drawback that you will loose the possibility to use the Virus as an Instrument at the same time. You will not be able to use all the 3 outputs and 16 channels of the Virus…
All the other big (and small) DAWs has this feature though.