Does "Talent: Do Nothing" mean?
1) A joke
2) The Talent keyword is on the card for future usage
3) The player can effectively choose to skip his/her turn by "doing nothing".
I am thinking #3 based on the Wikia entry, although I don't know what the gameplay benefit would be of skipping your turn.
If an ability says "Talent:", it means you may choose to resolve the ability once during your turn, as above. "Talent: ..." effectively means "Ongoing: On each of your turns, you may ...". (e.g. Archmage could have been worded "Talent: Play an extra action.".)