Hey oliver,
I tried to download the iceX2 demo to see how this works, but unfortunately the export level feature was disabled, so I didn't have a chance to see the script file that IceX2 produces.
Since for a non-programmer it's easier to let Intense X load every level using Intense X's panels, so does your script file attempts to load the level it created as well, or is it just a collection of actions that get activated once the user loads the level on his own?
Btw, if you like I'd be happy to trade you a copy of IntenseX for IceX2 just to get to see how these two work together.
Cheers,
Aris