I recently switched from WinRAR and enjoying the 7-Zip File Manager so far. Thanks.
One usability feature that I feel is missing is that pressing ALT+UpArrow doesn't navigate to the parent folder. This keystroke is quite standard, being supported in both Windows Explorer and WinRAR.
I would be happy to investigate adding this feature to the code if that would help. Just let me know whether you'd accept the patch before I spend my time on it.