Joints (Constraints) // crashes

[KMKaine]

Hi! I'm working on a project where part of wall has to explode into the room. I'm working in Maya and realflow, and I'm doing the dynamics in realflow, because maya is impossible to work with dynamics properly.

Now, I have a wall exploding part divided into shards, done with some offset so they don't touch each other, but some do touch the rest of the wall... Is there a way to fix this easily, instead manually moving vertexes?

Now I have 2 things i'm running into:

I saw in the realflow4 tutorial here on DT a way to write an expression to make some fixed constraints for the shards, so that the wall doesn't collapse until it is hit by something.

Well, that script doesn't work in realflow 5 :-S They got rid of the Constraints I think, and made a MultiJoint instead. But I have no idea how to accomplish the same effect with that node?! Do any of you guys have an idea how to constrain it all the same way as in the tutorial?

Further more I have a simulation of 2 walls behind each other, in total consisting of 500 a 600 shards... And my realflow 5 keeps crashing on that :-S Are there some settings / configs I need to know about?

I'm working on a HP xw8600 workstation...

Thanks for the time!