Made a little tool in Construct itself - it makes learning the particle tool easier by allowing realtime control of almost all the parameters. You do need to type them in, but it's still easier than changing the settings, starting a layout, exiting, rinsing, repeating.
Anyhow, it's a .83 cap. I might add togglable one-shot options and the other fade types as well. Depends on feedback - if anyone needs it.
Grab it here: http://dl.dropbox.com/u/1328856/ParticleStudio.cap.