setting layer transforms or source with script

Hey guys,
I’m trying to create some tools for my team and I’m finding the scripting environment in SBPro really limiting. By using some functions that aren’t recommended, I was finally able to read layer transforms (position, rotation, etc) with MotionManager.getNodeMatrix, but I still can’t set any of those values. Is there any way to do that? Or change a layer’s source artwork?