I'm creating quite a few particle effects at the moment, and need very precise values. As the GUI uses graph points to set values, I have to hand edit the settings by using the explorer to copy the string in eParticleContainers -> [particle] -> ParticleContainerParticles -> ParticleContainerSettings, edit it, then paste it back in again multiple times until I get the right values.
It would be so much easier if the editor had text boxes with the values as well as the graphs to change settings.