Debian exim4 SRS forward only how-to

Hi All,

I have a forwarding service running on Debian box and I got into the SRS topic 
only because my mail forwarding stopped to work. I suppose I am in a position 
of an average admin, who simply wants his server to act as it was set up to do 
in the pre SPF days.

I found no how-to about setting up SRS with exim4 under Debian and actually 
have no clue how to implement this. I need just SRS, not whole SPF, and only for 
forwarded e-mails!

Can anyone answer these questions, however stupid they may be:
0. Can I use just SRS, without SPF?
1. Do I have to compile exim4 to get SRS working or can I just use some pipe 
in .forward?
2. What should my .forward file look like?
3. What should the srs.secret file look like?
4. Do I need any other files than I already have (see below)?
5. What changes in exim config are needed?

Thank for you time and support.

Here is some info on what I have right now:
1. I am running the latest debian exim4-daemon-heavy (4.50-8)
2. I apt-got the following packages:
- Package: srs (0.31-1)
- Package: libmail-srs-perl (0.31-1)
- Package: libsrs2-0 (1.0.18-1)
3.The important files seem to be:
usr/bin/srs, usr/bin/srsc, usr/bin/srsd, usr/lib/libsrs2.so.0, usr/lib/libsrs2.so.0.0.0, 
usr/share/perl5/Mail/SRS.pm, usr/share/perl5/Mail/SRS/DB.pm, 
usr/share/perl5/Mail/SRS/Daemon.pm, usr/share/perl5/Mail/SRS/Guarded.pm, 
usr/share/perl5/Mail/SRS/Reversable.pm, 
usr/share/perl5/Mail/SRS/Reversible.pm, usr/share/perl5/Mail/SRS/Shortcut.pm	

Kind Regards,
Michal