Default [Q] Underwater Photography?

Hi I am looking forward to taking my S5 with me on Holiday and looking to take some underwater pictures and videos I understand there are certain ways for this to be achieved I'm currently on x-note rom rooted,
I can take pictures with the volume buttons but it seems I have to start a video out of the water and then hope that the video does not stop when the water hits the screen.
My question is, Is there anyway of changing this so I could use one of the volume keys to start and stop a video? Also a way to disable the stop recording button on screen as it seems the water hits that sometimes and stops recording.


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