LimeWire decided to put an end to requeries because some vendors were abusing the feature. That also meant requeries sent by LimeWire would now be filtered by LimeWire ultrapeers, so it didn't make any sense to keep sending requeries when they would never have a chance of finding anything because they would not be transmitted by LW's ultrapeers.

When you are disconnected try the File->Connect button. That should work unless you have been disconnected for too long.

I can assure you there are no hidden keystroke shortcuts (I think there are no keystroke shortcuts at all). All features are available as buttons or popup menus.

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Morgens ess ich Cornflakes und abends ess ich Brot
Und wenn ich lang genug gelebt hab, dann sterb ich und bin tot

--Fischmob