1 : I dont really know but with my bow, i see a huge difference from 130 to 160 even if it's 99 accuracy, mainly draw speed, size and timing of the reticule
2 : This was the old system. Each kill in a radius neer your char would give you some exp and gold (depending on the lvl of the ennemy that died), now you get 1000 base exp/min of gameplay dead or not.
3:With bows;yes
crossbowsl; no
throwing; errr, who throw anyway?