I post the idea of making a toolbar that could interact with the tab key the same way it does in terminal (completion etc...), without loosing hand when TAB is pressed more than two times.
Fixed with revision 21428. 2006-05-01 Benedikt Meurer <benny@xfce.org> * thunar/thunar-path-entry.c: Popup the completion window when the Tab key is pressed. Bug #1745.