for dual mesh links.. run stp on the Switches behind the Mesh APs... thats it.. no need to run on AP..
The AP will automatically pass BPDU over the Radio interface.
Aviv,
BPDU's will pass over the mesh link if you have stp enabled on the Wired Switch.. in order for BPDU to cross the mesh.. (not a good idea as it does take up mesh bw/broadcast) . you don't have to do anything. if you want to stop bpdu's from cr...