[ksk-rollover] Stand-by KSK for algorithm rollover

Hi folks, I noticed that no stand-by KSK is pre-published in 2017-ksk rollover, right? I put it due to the limitation of size of DNS response. Any other concerns on stand-by KSK in real production network? Now I’m planning to put a stand-by key in algorithm rollover in my lab test. Because I think ECDSA saves much space than RSA, so maybe it is time to consider Stand-by key for algorithm rollover. Is there any special consideration should be taken care for stand-by key in algorithm rollover. Thanks in advance. Best regards, Davey