That's pretty much exactly what we do, we get the cameras into sync using the network then fire a precisely synchronised (us accuracy in our case, so 1000 times

That's pretty much exactly what we do, we get the cameras into sync using the network then fire a precisely synchronised (us accuracy in our case, so 1000 times worse than yours :) ) a 10 to 150us IR flash to capture the specific details we're after (in our case using retroreflective targets). Main claim to trickery for us is we're worked out a way to sync the Pi cameras in software (i.e. no additional hardware needed). Very cool to get a reply from someone working in your area, I've followed AMANDA etc in Science and Nature for many years - thanks for the comment!