Looking at the video I didn't really see a "slow flash". Does this lamp have a slow flash?
I just talked to a guy who just bought a couple of the Vivid Pro's. While it doesn't have memory per say it does have a separate flash menu with the slow flash being first in line. Down side is you have to "push/hold" to get to the slow flash but that could work, at least for me as long as you don't have to press real hard ( and the pressing doesn't throw off the aim of the lamp ). I'm waiting though to hear from him about the frequency of the slow flash. . To suit me it has to be at least one flash per sec. or longer.