[Freeswitch-dev] Verto receive video only?

I poked around the Verto JS code (currently jquery.FSRTC.js and jquery.verto.js as far as I can tell), and it doesn’t seem there’s any way to pass offerToReceiveAudio/offerToReceiveVideo as a constraint when calling createOffer() on the peer connection. I’m asking because I’d like to receive video only instead of both audio and video. Is there some magic incantation I’m missing? Or should I file a PR to add this capability?