i want this :
macos has two little buttons in the right corner or your folders. One wraps your folder up and the other one makes your folder the minimal size (still square).

now windows seems to have this feature that opposites that last option, it expands your folder to the maximum of your screen. How can I do that on a mac? I like big folders.

I also would like a delete-key on my imac-keyboard (non-pro) which extension could i use?

1) Option-click the zoom box.

2) http://www.newrenaissance.ibs.ee/forwarddelete/