I was going to post about lever positioning on trekking bars as I am thinking of swapping my drops for them and thought the sides or front may be better but I can't really see any advantage to using drop levers tbh. Perhaps if you were putting trekking bars on a proper road bike with caliper brakes and had no choice but I think most people with trekking bars have v-brakes (one of the reasons I want to change is to get away from drop levers and cantis). I know you can get drop levers for v brakes but why bother on a trekking bar?

btw re the 'neutral' hand position. Loosely hold a pen in your fist and let your hand and arm hang naturally.Then lift it in front of you. The pen will be at about 30-40 degrees not 90 as in shaking hands.