https://www.youtube.com/watch?v=ggGCuSrgeXwHere's the shooting speed/range they have. For some reason shubla's client only shows that line for hunter's bow.
You have to click again to charge the next arrow, but you can always click again to change the direction in which you're shooting and reset the timer.
The speed/range is not affected by anything. Q10 bow with 10 marksmanship is the same as q10000 bow with 10000 marksmanship, in terms of speed/range.
Marksmanship now acts as a softcap on the damage you do with higher quality bows. So for example, if your bow is q150, you will need 150 marksmanship to do full damage.
At the same time, the damage is calculated as your Marksmanship*Perception VS. your target's Marksmanship*Agility.
Also keep in mind that shooting things at point blank range does insignificant damage.
Hope this answers all of your questions ^^