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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
aked for the feature at github: https://github.com/Codewars/codewars.com/issues/358
raised: https://github.com/Codewars/codewars-runner-cli/issues/159
http://www.codewars.com/users/
Put the ID of your friend directly in URL and fire away.
I've found a few contacts using their github ID.
P.S.
+1 to your suggestion of course, I've seen similar to those a plenty though. Try to find existing one and upvote it.