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If unwired it would default to 0, and at least let thread switching occur. You could maybe right click on the loop and remove the wait node to make it run as fast as possible (like it is now), but it should be there by default... Maybe also right-click on it and get to choose between "Wait (ms)" and "Wait until Next ma Multiple"?
(PS: I know that you can do this using timed loops, but I'd like to see it in all of them - I've seen too many "programmers" complain that their CPU is at 100% because their loops are going nuts).