delting old revision files from repo will only delete the headrevision, plus filename case problem

I came across the following (for me) surprising behaviour:

Repository looks like this with only two files Fa and Fb, just for
simplicity:

Revision 1: Fa:1; Fb:1;
Revision 2: Fa:2; Fb:1;
Revision 3: Fa:3; Fb:1;
Revision 4: Fa:4; Fb:1;

If I open repobrovser into revision 1 and delete Fa:1 (using delete
button) I get the following repository:

Revision 1: Fa:1; Fb:1; <-- Fa:1 is still there although I deleted it
Revision 2: Fa:2; Fb:1;
Revision 3: Fa:3; Fb:1;
Revision 4: Fa:4; Fb:1;
Revision 5: Fb:1; <-- Fa:4 is gone in stead!

I.e. I thought to delete Fa:1 but I deleted the head version of Fa! In
fact, Fa:1 disappears from the repro-browser file list right after
delete, but re-opening the repo-browser reveals its still present in rev
1.

I would argue that TSVN is somewhat misleading the user here, because it
deletes, without warning, a different file as the one I was expecting to
delete, and it removes the file from the file-list, whereas the file
actually remains.

I guess I still have stuff to learn here, but to me it seems not
possible to get rid of old revisions. Right?

You will probably ask why I would want to delete old versioned files.
The reason is that I have got a repository haunted by duplicate file
names differing only in case. When I checkout one of the old revisions,
I get the (in)famous "missing file" error. So I simply thought to get
rid of the ones with the "wrong" name. But that does not seem to be
possible. So I basically cant checkout these revisions, or can I?

Thanks for any advice you can give.
henning

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