forum.opsi.org

One BIG REMARK:

-i option MUST NOT by default overwrite or remove the installation directory/files when upgrading a package.
I had some custom scripts in preloginloader for instance, and when I upgraded (installed new version) they had been deleted
OPSI packages should behave like debian packages, i.e.:
overwrite/delete only the files that were in the package. the rest should be left intact.

Yes, this would be nice!
Are you willing to spend some money?

No, some effort.
Actually when thinking about it, i cannot see a good reason why not to use debian's dpkg deb style packages and scripting.
But that's just a suggestion for you not to invent the wheel again..