One feature I'd love to see in Particle designer is user data. I've made some extensions to my particle class, but there is no way for me to specify my custom params in the editor.
What would be nifty is if there were a couple of sliders and a couple of text entry fields that could be used as user data. They could emit in the xml as userData1, ...
I realize I would not be able to see the effect in the editor, but it would save me from having to always add code when I init those particles.
Thanks again for a nice tool.