init 999 python:
  renpy.config.rollback_enabled = True
  renpy.config.hard_rollback_limit = 256
  renpy.config.rollback_length = 256
  def unren_noblock( *args, **kwargs ):
    return
  renpy.block_rollback = unren_noblock
  try:
    config.keymap['rollback'] = [ 'K_PAGEUP', 'repeat_K_PAGEUP', 'K_AC_BACK', 'mousedown_4' ]
  except:
    pass
