P.S. the future "Debian Bikeshed's" infrastructure will fulfill an analogous role to Ubuntu PPAs. When it's deployed (no idea when this will be...not any time soon from what I can tell) it would be worth contacting the maintainer of Scribus to see if he/she is planning to do an unofficial backport.
It sounds like a project you might be interested in collaborating on :-) Cheers, Nicholas
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