I second that, I have a S50 and now a S30 currently I'm having to use 2 devices to control them separately. If the 2 Seestar's have been set up on the one device it should't be hard to switch between to two using the MAC addresses as they have previously been connected.
I have tried a sort of solutions by going to the WiFi setting on my tablet and switching between the S50 and S30 and controlling them, but I have noticed that it dosen't seem to store the setting of the two Seestar's separately within the app, this could be a minor change in the coding to allow separate storage for both Seestar's.
Something for the team to look at instead of using two devices to control each Seestar!