I agree with the FO handling the A/C with two hands for the most part ( next time I will ask the FO to engage the AP for me since I am unable to fly with 1 hand).
The "single" hand action won' t lead me into believe that the FO is not interested in the job ( flew with plenty CN in the past who we're not interested in the escape routes charts or ANY briefings over high terrain at all for example).
However I will NOT go out of my way to report such petty event to the CP. It will show how under confident I am.