Yes, it is possible to run two sets of front L/R speakers.

One would need to be digital (i.e. your DSP5200) and the other analogue from the OA08.
Make sure the OA08 is configured correctly (check the jumper links on the actual card).
Configure the unit for Analogue fronts; the digitals will work by default. Volume for the digital speakers is controlled inside the speaker via comms (so they are fed with a fixed digital signal).

Ignore what the configuration program makes you do...

If you needed to run two pairs of analogue fronts, then if you had two OA08s or OA18s (or a mix), you could configure the jumpers the same on both cards, and they would both produce front L/R, etc.

Let us know how you get on.

Cheers,

Steve