You can do some trickery with this, though. For example, say you want a door or door glass breakable after you've opened it. You can use an env_render triggered after the door opens that sets the renderfx of the door to 0 and the renderfx of a breakable, fake "door" or glass placed where the actual door would be in its open state, to 255 or 1 or 185 or whatever you want.
There's a tutorial on doing rotating door handles that explains the same effect on VERC, which you may also be interested in.