The only exception to "only using the lee side cleat for the jib" would be if you need to go hove-to. This is a very useful technique to know if you ever need to "park" your boat. Release the mainsheet and traveler, push and hold the tiller all the way to leeward, and pull the jib in hard on the windward side. The boat will remain in a very stable position and slowly claw its way forward, even in very strong winds.
Otherwise, I agree with the others. Never sheet in the jib using the windward sheet/blocks while under way.
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