I've been messing with that in my number game. You could try setting up 2 rules instead of just one to make it seem more random (when really it's less random).
For example, if you want a number out of 10, but you don't want a whole string of numbers above 5 say:
Rule: lastNumber > 5 newNumber = random (1, 5)
otherwise: newNumber = random (6, 10)
At least this guarantees you won't keep getting the same numbers. You could make more rules depending on how spread out you want it to be.
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Spawn actor
For example, if you want a number out of 10, but you don't want a whole string of numbers above 5 say:
Rule: lastNumber > 5
newNumber = random (1, 5)
otherwise:
newNumber = random (6, 10)
At least this guarantees you won't keep getting the same numbers. You could make more rules depending on how spread out you want it to be.