From what I could research, there is no way to add an exception to the black listing. This is a shame, and I'll submit it as a feature request (if it isnt already)
I'm not going to disable the IDS module on my production WLAN (of 6000+ devices) just to allow one through - that seems ridiculous. I'll keep playing with my tool to see if I can tune down the ARP and PING frequency, or might have to tune the threshold up a little in the IDS settings. Would still be nice to be able to add a black-list exception, doesn't seem like it would be that hard to code into AOS.
Thanks for your insight and reply though.