Does an electric plug exist which would prevent accidental removal from the socket

It's more likely that the problem you're experiencing is high inrush current. All the gear you have connected is going to use switchmode power supplies, which have characteristic high inrush current when first connected to power as large capacitors inside charge. The inrush current for a switchmode supply can be many times higher than its normal consumption, though only for a very short period (less than a second). See the inrush current row of this table.

It is possible that the combined inrush is enough to damage your board/pop fuses. The only way around this would be a board that can handle more current (may not be practical/easy to find one), or to stagger-start the devices - that, is don't have them all energise at once. Neither of these solutions is ideal, you may need to look at spreading the devices over two boards.

Give it about a month and it will be out. Our company just had a meeting with our Lutron representative and it should be out real soon. He did not give a date but I think they were waiting for Lightfair to make it official.

EDIT I talked with the factory rep today and he said orders (on distributors level) are being accepted now and the C•L should be available for consumers in July.