wouldnt it be possible to have a dnsserver for hidden tor services, given them more "natrual" names?
Yes that is one of the uses of namecoin.
While there is a proposal for a separate "tor/" namespace,
https://dot-bit.org/Namespace:Tor.onion addresses can also be specified as a "tor" value field in the regular d/ namespace as shown here:
https://dot-bit.org/Namespace:Domain_names_v2.0