Oh, yes. Everything works (communication between WLAN and LAN has no issue whatsoever). I suggest, of course, using the patches from here in case you were going to try any of the others I've mentioned or sent you (that one is all-inclusive).

Again, I've run into no problems yet (well, at first the WAN connection was extremely slow, but this seemed to be a random heating issue or something because it's left and won't repeat itself). I'm not sure what you mean when you say "firewall does not expect such packets"--ebtables is like a lower-level iptables almost (afaik), and with no rules set the bridge should operate exactly like it would without ebtables at all.