What version are you using?
In newer versions (nightlies), we have 'Show file in the project tree'.
I am using the svn builds. I haven't found a setting you are speaking about, where it is?
Right click the tab or the editor, so the context menu opens. For me it's the last entry in it.
They can also be [...] at its sides.
Not at the moment, because it's not (yet ?) implemented in wxWidgets.
If you are finding attractive to have a misleading information in the project tree then I have nothing to add.
If you scroll through the tabs, it might lead to a slowdown for large projects to find the file in the project-tree.
Not yet tested, but should not be too hard to implement (possibly configurable).