No it dont support scrollable dropdown list.
Are you talking about languages or resolutions? Because i dont think we have problem with languages. I mean we dont need to gain space here, we only use space we can use.
About 2 columns, maybe the option window is too small for it.
About another window, why not, but maybe we can create a tab and sort the content between "basic", "advanced", or finding another logical structure. But i dont think current "key" navigation is the better way.
About a scrollable selectbox, maybe it is not very hard. But i dont want to merge the scrollbar code into the selectbox code. I think we can do it without a merge, and maybe the current system own every thing it need for it. But it need work, and i dont think this feature is really need. i can be wrong.