Hi jimijamesi.
Regarding point 1 we could add many, many things on the grid view, I've just added the SKU for green but maybe that has a limit. Maybe there's enough code for being easy to customize. Having the possibility to have another field as quantity would start to make the grid to big when user may easily select the quantity on the cart page.
Regarding points 2 and 3 both are related to the css style sheet provided where everybody may add all the adjustments required to fit the site design. I've tried to add as many id and class to identify every piece in order to be stylized easily. If you want borders to disapear just go to the css file and change them to 0 (the ones related with the table).
Regarding 4 it's true would be nice. We're discussing some more basic options to add to the next official release, perhaps that could go for the next one 
Thanks for your comments.

Joined: 10/31/2007