Axiom Home Page Forums General Discussion Technical Questions Denon 3805 A/B Surround speakers help

Surround B is for a second/alternate pair of speakers, like direct firing for 5.1, SACD, and DVD-Audio. The surround back left and right channel are at the bottom right of the diagram on page 15.
I would like to wire the set up as follows. I only have 2 pairs of surrounds QS8's (on the side) and M2's (in the rear)

For 7.1:
QS8's to Surround Speakers System "A" L & R
M2's to Surround Back L & R

For 5.1 Music:
M2's to Surround Speakers System "B" L & R

I want to know is it is okay, safe, or even adviseable to run the Surround Speakers System B to the M2's at the same time they are also connected to the Back Surround L & R. Please are there any hazards or sonic problems with this set up?

Thanks again