No unfortunately that in't possible. The virtual rides are in the same car filter as the default URD cars.
But i usually add AI's 1 by 1, so i don't have double AI cars.
- In practice session: Click on the little arrow next to AI
- You'll get a dropdown list of all the cars: click on them to add them. It takes me a few seconds to add a full grid of AI: IMO not a big deal.
But if you want to do it automatically with the filter a repack will be needed.
BTW: for offline purpose: You can give each virtual ride different AI talents, setups, ... ==>
Take a look at the 80's pack for the Celica GTO.