Hi Yoda,
I don't think the Kaplan verbal questions helped me much in my preparation. Specifically I don't think doing the Kaplan RCs and CR questions helped me much. Infact, most of the time, the passages were so complicated that I was having trouble comprehending the ideas. The CRs choices were usually very vague and most of the time, I felt that the reasons they provided for choosing one answer over another were lame...
One thing that I used in my preparation for RCs and CRs are the official LSAT questions - They are a little more complicated than the ones in GMAT, but they helped me in improving my speed.
Regarding the timing strategy, I always tried to maintain the same pace throughout the test - I tried to avoid spending more time on the first few questions. But in the actual exam, I ended up spending more time on the first few questions because I was re-reading the answer choices and double checking my answer etc. But I guess the key is that if you find that you have less time half-way through the test, don't panic, simply pick-up your pace. Most of the time, one answer will stand out as the right one. If you are very short on time, simply trust your instinct and pick the one that you feel is right and move along. It is better to do that than to end up randomly guessing on several questions. Again, this is just my 2cents. Not everyone may agree with this strategy.