file-roller doesn't provide deletion of folders in some type of archives

Binary package hint: file-roller

Technical info:
* file-roller v.2.24.1
* Ubuntu 8.10 (latest updates)

Bug info:

1) make e.g. 2 directories - test1 & test2, put some files & folders in each.
2) select both and make ZIP archive by file-roller.
3) well, now open it in file-roller and try to delete folder test1 for example - select it and hit DEL (or by context menu, doesn't matter). make sure, that in dialog box you check "selected"
4) all files and folders within that unhappy directory will be deleted with no remorse. BUT NOT their parent directory "test1". That is.
5) Instead of that - on step 3 if I select 'all' in context menu - all two folders test1 and test2 will be deleted!

That affect only at ZIP archives (I tried ZIP, RAR, TAR.BZ2, TAR.7Z, TAR)

P.S. Second note - in pure 7z archive function of removal seems to be not implemented at all - when I try to do that error happens:

** 7-Zip 4.58 beta Copyright (c) 1999-2008 Igor Pavlov 2008-05-05
** p7zip Version 4.58 (locale=ru_RU.UTF-8,Utf16=on,HugeFiles=on,1 CPU)
**
** Updating archive /home/boobaloo/test2/test2.7z
** System error:
** E_NOTIMPL

But, what interest - when I use .tar.7z - I unpack archive twice, then delete what I want in TAR and then succesfully update 7Z. that little bit strange.

Cheerz!