adding a line serie to a stacked area graph + adding secondary labels on Y axis

what can i do, and what not

1) i need to make the area-band

i can do this by using the stacked area graph, and then make the first area transparant
is this the best way ?

a) but the problem is that my graph starts at x value 0 and ends at x value 4
is the only solution to this: leave a row open above the numbers or labels ?

b) i need to add a line onto the graph, but i cannot do this,

c)can i add next to the Y-as words which do scale along with the graph ? (i can put them there by adding it as a text.

thanks so much