Wow! a great thread and i managed to reach to the bottom of this.
Here's my take on this... I would rather spend a few minutes to get my concentration in action than start shooting from the first question (maybe solving a few questions before the test is a great idea). In my opinion, reading questions is the most essential part of the test taking technique and answering question is secondary. If, for the few moments/first 2-3 questions, I start focusing on this essential part of the question (what is required/what needs to be worked out/what is asked), half of the difficult job is done. This will also prevent us getting tricked by GMAT.
It is very natural for us to be on the edge when the first question comes (not so much before verbal, because one is already in the test taking rhythm) but more so before Quant. These first few seconds are "the moment of truth". Getting the rhythm right, reading at the optimal speed and not really thinking about the answer, but focusing on what is required as answer from the question stem is what will be my strategy to begin with.
Once I get the tempo right, confidence level high, breezing through the questions would be easier. Getting my mind to focus on the right aspect of the question is the most difficult part.