You might want to ask in the Olympus thread - there's at least one TG-6 owner in there.
Olympus OM-D E-M5, E-M1, E-M10 - Mk1, Mk2 & Mk3 Owners Thread
Yes I agree with certain bugs or trying to catch certin critical moments TTL is a real pain, the beauty of photography is adapting to the situation. I find photographing Doli flies is near impossible using TTL as the pre-flash spooks them everytime. The few fixed setting I do use is; hand...www.talkphotography.co.uk