Re-search *is* available. Just right click on the previous search and you'll get a drop down box which includes the option to re-search. This works on Macs too - though I can't remember which click it is.

The search frequency is set as a compromise between flooding the network with searches and actually finding things - Yes, I agree that it seems too cautious at the moment.

The Requeries *are* re-searches. Just not every five minutes as they give the impression of (I heard a rumour that it was every 45 minutes).

Mark