Yes. But this file browser has multiple hierarchy. So I think "../" sign is good for understanding it.
You have enough skills I guess. So you don't need it. But I think all of users has not enough skills like you.
I guess someone make a new feature request which is "pls add ../ " near future.
So I mean , it's a each persons preference.
Anyway, We must make a core functions for file browser itserlf(copy/move/multiple select/progress) first.
Then , we are looking for best GUI interface IMHO.
If you agree, your first request , Please close this request. And If you want to remove "../", make a new request when we finish to make a core functions of file browser.
See also:
http://www.magiclantern.fm/forum/index.php?topic=5522.new#new