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One suggestion: create a new property to be indexed with products/skus that contains a random integer value (using property-accessor attribute at product-sku-output-config.xml) and make this property "is-dimension=true". So, when you want to sort records randomic, you can use this property.
Another way, more complex, is to customize RecordSpotlightHandler component class to re-order records selection before return to browse page.
Make senses for you?
Hope it helps.
Thanks Grando, I used the second alternative.
I extended the RecordSpotlightHandler handler.
Getting all records returned and applieding the Collections.shuffle function that makes a randomisation of the records.