The "Directory Menu" is a useful plugin to open a directory of choice...
...but its usability could be even better:
Assuming you want to open Thunar on ~/A/B
... one have to walk "Direcory Menu" --> A --> B --> Open Folder
The improvement would be to support double-click on a folder item to open it:
"Direcory Menu" --> A ==> B
(where B is double-clicked)
This way it would be nearly 50% faster to open a 2nd level subdirectory ;-)