Oh, i`m so happy, look at the today`s update:
Second, the new Persist behavior allows you to make persistent layouts. Normally if you leave a layout then return to it, all its objects have reverted to the initial state as you designed in the editor. Sometimes this is annoying if you want, say, the player to return to a previous level but with all the enemies they killed and powerups they collected still gone. Now you can simply add the Persist behavior to objects you'd like to remember - in this case, the enemies and powerups. Then on returning to the layout, all those objects are exactly as you left them.