So this is the post
![](/ubbthreads/images/graemlins/wink.gif)
There are two ways:
1) Create seperate entities for collision that are invisible and with a mass of 0 [zero] as said by Fear411.
2) Use groups to store additional entities used in the same way as above, except apply the child action to them, and the compound-collision flag as well. This way's a little harder, but may provide better results...