Hi Nikolai,
Basically what you're talking about is just happened - some hours ago 'ipset'
was accepted to unstable, see
http://packages.qa.debian.org/i/ipset.html
When credits for preparing standalone 'ipset' package goes to Neutron Soutmun,
yours truly played a key role in coordinating and preparing a non-colflicting
upload of both packages (ipset and xtables-addons).
Next challenge would be to backport ipset...
Regards,
Dmitry.