Separate dirs for original and own packages?

Dear group, I would like to use the original version of a SuSE mounted read-only, but I have some additional packages that should also be installed. Is it possible to have a separate installation directory for own packages when using autoyast? The documentation only states that it is no possible to hold everything in one place, which leads to the assumption that the opposite is (was?) also possible. BTW, I didn't get any reply to my last question about the sysconfig variable mystery. Is it really a bug or something trivial I have misunderstood? Best regards Ole -- Sparen beginnt mit GMX DSL: http://www.gmx.net/de/go/dsl