Denite lets you move up with U and down with <Enter>, and you can use a custom filter or source to only display files in the current directory I believe. You could configure denite to include the custom filter and mapping in the after function.

The ability to edit the full path... I honestly don't know of denite or unite provide enough support to do that, but Shougo or someone on https://vi.stackexchange.com/ might.

Anyway you can set that up then configure a custom command, but I'd note that directly emulating spacemacs isn't really what spacevim seems to be trying to do.