I think that function 'Wait" known from rpg maker would be great addon for eavent sheet editor. In stead of plaing around with variables, and making special events for substracting/adding variable value every x ticks, we would get the same resoult by putting 'wait' betwen other functions. for example: object colision -> play animation 1, wait 5 sec/x.x ticks/till animation is over, play animation 2.
this would be extramly helpful with simple event behaviors.
i hope i've explained it clearly enough^^