I have made a new utility called sce-pkgcheck that tells whether a package is from the main, security, extra, or prebuilt repos. Or as a meta package in our own dependency list file on the server, or if it does not exist. This can be used to check for package existance. Sce-import already has a lot of command line switches, but I may consider factoring this into sce-import during use of list files when a switch is used.