I've always wondered, does it take effect when you didn't use any actions for a turn, or is it IF you didn't use ALL AVAILABLE actions in your turn? I've been using it the first way mentioned, but the wording always threw me off a bit.

You have a non free action for every 100 points of you build to use every turn. If you don't use all of your available actions on a turn, whether it's 4 of the 5, or you opt to clear and use nothing, you still get your token.

Terrific card. Probably the best "support-based" Feat in the game.