Does Notepad++ have an "unclose" command?

Its actually Alt+F, then hit number 1.

When you close a file, NP++ (for better or worse) sticks it at the top of the "recent files" list in the File menu.

That recent files list is actually a mind twist considering it only adds an entry to that list if you explicitly close it (so if you Save As, your file WILL NOT go to that list,) and it deletes an entry from that list as soon as you open the file (so you have to close it again to make it appear in the list).

Notepad++ now has this shortcut to restore a recently closed tab.
Control+Shift+T will restore the last recently closed file.

No, there isn't. Not sure if it's doable with a plugin though, I'm alright with the recent files list.