He asked me the following questions, and I am including my answers to those questions.
First, I need to make it crystal clear that the following is my take only - the world according to Papa D:
Which "laws" do you think are necessary for becoming like Him?
The ones that deal with internalizing love, including some that aren't obvious at first glance. Probably not much else, since everything else hangs on love.
Do all LDS policies, rules, etc. fall into that camp?
Absolutely not - and I guarantee there is unanimity in the top leadership of the LDS Church with that answer.
Are some laws more important to keep than others if we are to become like Him? If so, which ones?
See my first response. (Wow, that was easy. *grin*)
Which laws from God (as defined by the LDS church) have unintended consequences, and when (if ever) do those unintended consequences outweigh the benefits?
All laws, policies, rules, etc. have extraneous consequences, some that are not "ideal". The policies, rules, hedges about the laws, etc. have unintended consequences - all of them. The consequences outweigh the benefits whenever they do.
I really don't mean that last answer to be flippant. Each one of those policies, rules, hedges, etc. will have different consequences for different people - and even for the same people in different circumstances, which means each of us ultimately has to answer that question for herself. I simply would add that distinguishing between God's law and man's best attempt to figure out God's law is not an easy exercise, which is why personal revelation, agency and accountability are such a central part of Mormon theology.
That's both the beauty and the danger of pure Mormonism.