hey pacificnw,
What I'd suggest is this: plan a schedule for each section, dividing it into manageable chunks. For example, for the Quant, which is 75 minutes and 37 questions, have a goal of solving 7 questions every 15 minutes. Then set your timer to go off every 15 minutes, and check how many questions you have completed. If you see you're behind schedule, don't pause but rather keep going and update your goal - try and do the next section faster. If not possible, decide to go for less question and guess the last few.
Important note: If you see, after sufficient practice, that you don't have enough time to solve all question - revise your section goal. Decide to go for only 30 questions, say, and solve only 6 every 15 minutes. Get used to using this strategy, and use it on the GMAT test as well - checking yourself every 15 minutes and updating your goal.
If you do want to know how you perform timewise on a question-by-question basis, definitely don't do it manually. Rather, study with an online program (such as exampal) which keeps track of your performance for you.