Yup, you can still change the response timing setting. When using a preset mode, the options which you can no longer change will be greyed out for you.
I haven't noticed any issues with the high preset but decided just to stick with medium in the end as it is the recommended setting since image sticking "may" occur with the high setting but during the time I did have mine set to high, I couldn't notice any issues.
Not sure about game mode but on this monitor it is terrible anyway, image is just blue and horrible looking. I think the input lag is pretty much 0 already.
Overall, can't say that I have any issues with MP online gaming.
I haven't noticed any issues with the high preset but decided just to stick with medium in the end as it is the recommended setting since image sticking "may" occur with the high setting but during the time I did have mine set to high, I couldn't notice any issues.
Not sure about game mode but on this monitor it is terrible anyway, image is just blue and horrible looking. I think the input lag is pretty much 0 already.
Overall, can't say that I have any issues with MP online gaming.