Ben Yagoda has an article in Slate on a “currently very popular tense” which he calls Kindergarten imperative (as in “I need you to put away your crayons now”). He sees the last remaining preserves of the old imperative in traffic signs (“Stop”), farewells (“Take care now”), and song titles, especially Beatles songs (“Come Together,” “Don’t Let Me Down,” “Get Back,” “Please Please Me”).
The Kindergarten imperative, he observes, is a construction also favored by flight attendants, who often inexplicably add the phrases “go ahead and” and “for me,” as in:
I need you to go ahead and put your seat backs in the upright position for me.
I need to check my grammar books. Somehow I thought that the imperative was a mood, not a tense. But perhaps it is different in English.