"Random" Chases

This might have been discussed before, but here it goes...
If I create a list of cues and set that list up as a "Random" chase, is the timing between the cues random as well as the cues themselves? This question is based on how to create a good fire effect or flicker effect, like a flickering flourescent. The Random1, 2, and 3 that are in the effects engine default choices are nice, but there is a very noticable pattern to them. Is there a pattern in Random chases too? If so, is there a way to add some sort of random timing function to effects?
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