Actually Dave, it's decreasing dilution that increases contrast! That means adding more of the A and B solutions to the water. This is the main way of changing contrast. Another is to increase agitation. Increasing time will have very little effect as the dev is self-limiting to a point. Increasing time will increase shadow detail but not affect highlights so much.
Prescysol is such a forgiving developer that the times suggested will almost always give printable negatives. If you're a sufficiently advanced photographer and like a particular 'look' in your negs you can fine tune. Les, for example, likes very contrasty negs and often mixes EF at 5:5:100. I keep telling him he's wasting developer, but you know Les...
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