I can't see your example video due to restrictions on the network where I work. (Do you have the rating set for the video?)
Do you have Trapcode Particular? It's a third-party particle effect that might give you a bit more control.
Although, this might be easier to do with Vegas on a mask rather than any particle system. (Effect>Generate>Vegas)
Sorry I had it set to Private. Should be able to view it now.
No, I don't have any 3rd party apps.
I'll look in to the Vegas effect though. When you say "on a mask." What do you mean exactly?
Vegas can be applied to a channel (such as alpha) or a mask. So you'd make a mask for it to travel on. You can have it taper and everything. You can add other effects like Glow or use multiple copies of your Vegas layer (using the copy with property links option) and just change a few parameters with some screen or add blending modes to get a really nice glowing look.
More info here: Generate effects in After Effects