Yes, the 890 and the pro can control multiple Z-Wave dimmers. I have a total of 6 dimmers connected to the 890...
(2) Intermatic HA03C - Z-Wave Lamp Module
(4) Leviton RZCZ1-1LX - Vizia-RF 1-Zone In-Wall Controller
3 more HA03C's are going to installed for the star ceiling, ceiling rope light (indirect lighting), and walkway lights.
The HA03C's control the Berkline LED cupholders. (1) RZCZ1-1LX is in the equipment room and the other 3 are in the theater itself. Once programed to your remote, you can control them individually or together as "scene".
Example: When I go into the theater I turn on the main lights by physically pressing the switch for the main lights. While the main lights are on, if I goto RF controls on the 890 and press a scene I configured called "Movie Time", the main lights dim to off, the directly above the seating dim on to 50%, and the equipment room light turns on... ALL at the same time.
Really easy to configure.