The crust doesn't need to be too sweet since the pie filling is very sweet and tangy, add 3-4 TBS sugar.
I like a little bit of a crumbly crust for this. If you want it held together more firmly, add in an additional TBS of melted butter or two.
If you want a thicker crust, use 2 cups of crumbs (or if using a larger pie dish).
When pulling the pie from the oven...don't put your thumb in the pie...Trust me, I have done this more than once with pies! You may want to bake it on a baking sheet...Just in case.
Keep your whipped cream chilled until ready to use.