The SI Tech gloves have a little straw (? for lack of a better term) for equalization of the gloves with the suit. Not sure how useful it really is, but yes, my instructor said that as there was some squeeze on the gloves, his dexterity improved.
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Oh, and also, I have a friend who wears double liners, but his first pair have the fingers cut off. So he gets a little bit of warmth without any loss of dexterity. He also tucks that glove under his suit seal to help with equalization. I keep meaning to give that a try, but keep forgetting.
From their web site it looks like it is called the SI 5 Glove system.