[vetinari]

> Being able to open the context menu for the current folder, even if there are enough files to fill the view, without going up a level

You can, the windows context menu key/Shift-f10 work. If you have something selected, deselect it with Ctrl-Space before.

Some items in the context menu have shortcuts of their own (new folder: Ctrl+Shift+N, file/folder properties: Alt+Enter or Ctrl+I, rename: F2, etc).

> Being able to jump to files/folders in the current directory by name without opening search results

Not a solution, but a workaround: disable recursive search, and treat search as filtered down list. (I consider this one annoying too).

> Being able to add functionality to the context menu

Extensions can add menu items into context menu; for example, syncthing-gtk does exactly that.