Your welcome.
I'm not quite sure what can be done say for instance if you wanted to make a wall break into irregular shaped pieces when shot at or when an explosion occurs. (not including any default breakable walls)
I have not got into trying that kind of thing yet but may give it a go some time down the road. I have the feeling its currently not achieveable though from what Ive seen without searching through everything.
Its on the list of to have a go at waiting in turn.
Liquids, lasers, additional doors and weapons first.