> 1) setting compression level even for tar.gz

That's a hard question, because tar doesn't support setting the
compression levels for gzip/bzip2.

Two solutions are possible:

1.
tar cvf arch.tar files...
gzip --best arch.tar

2.
tar -cv files... | gzip --best >output.tar.gz

Both versions are terrifying.


The first one is wrong because of the doubled diskspace it requires.
The second one requires more coding, and results minimal size difference.


> 2) .a (ar) support

Not commonly used archive. Ar protocol handles it,

Konfigurator->Protocols

Select the ar protocol, and attach it the application/x-archive mimetype.

> 3) Especially for 7zip it would be useful to set the used memory (-md 
> parameter, see for example 
> http://amp.iem.pw.edu.pl/doc/p7zip/MANUAL/switches/method.htm
> for the list of parameters (older version) ).

7z is not a commonly used archive, and I think it'll never spread in the 
linux world because of its architecture.

- doesn't save the linux permissions
- the decoder should contain at least 6-7 totally different
   decompression methods
- its code is an ugly hack, a typical Windows mash

I don't predict any future for 7z. Only it's default compression method 
the LZMA has the chance to survive, but it's not sure.

The size of the hard disk are big now, compressed size is not relevant
- tar,gz    the fastest algorithm, and it's more important than the size
- tar.rz    (RZIP) is slower than LZMA, but generates better result
- tar.lz    (LZMA) requires much memory, fast with good compression.
- tar.bz2   slow, average compression, works well with few memory

Because of the uncertain future of 7z, I didn't put all of its features 
onto the GUI. I implemented only the simplest compression and 
decompression functions, which were easy to do.

Bye,

     Csaba

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