ninjabot requires f3+c to work. i don't think there's a pre 1.9 calculator available, so id recommend just doing normal distance estimation.

alternatively you could also do axis, but it'd be quite complicated (although perfectly possible) without chunk borders

yeah the ninjabrain calculator is allowed now. i highly recommend it, too, its great for speedrunning

yeah its allowed. i also use a mouse button to lower dps

in my experience hotkeying when you set a hotbar slot to a mouse button doesnt work in earlier versions. are you having trouble with mouse hotkeys?