like discussed on the mailinglist, a simple feautre which would do the following would expand the import key feautre to the ones described in seahorse help

if is sskey:
  cp id_rsa ~/.ssh/
  cp id_rsa.pub ~/.ssh/
  chmod ga-rwx ~/.ssh/id_rsa
  chmod u+rw ~/.ssh/id_rsa


possible problems could be:
- what if the user has got 2 ssh keys
- ssh keys consists on private and public files - only the private one is exported

You can#t create a public SSH key from the private one.