See this book starting on p. 24. He has some interesting perspectives on the importance and function of the Rav as a means of explaining Pirkei Avot 1:6 and 1:16 which both have the same expression עשה לך רכ - "make for yourself a rabbi". In particular, see footnote 6, as there are a variety of interpretations on these two. There are opinions stating that since your Rav is also your mentor in life, you should feel free to ask him about major life decisions such as the ones that you mentioned.
For years, strangers went to Rav Feinstein and the Lubavitcher Rebbe, among others. It is well-known that both of them advised thousands of people on all types of life decisions, not just halachic opinions. Undoubtedly, among these people were numerous local "yokels" for whom these two were their personal Rav. I have no doubt, that these locals asked their rav person "secular" questions, as well.
Granted, your rav may not be on the caliber as these greats; perhaps, he is, proportionately. The point is, that there is certainly a precedent to ask a rav about non-halachic matters. Often, there isa cross-over. For example, when considering taking a job, esp. one in another city, your Rav might know people there; recommend a shul, colleague, connections, or may advise not to go there because there are no Jewish resources. Would you, necessarily know all this, yourself? What if you had made your own decision and discovered you're in a non-Jewish city, and you're uncomfortable? If you had only asked your rav that question before you took the job!
Granted, I wouldn't bother the rav with a "trivial" secular question like "Which brand of chrein causes the lightest stain?" (Like that rhyme??) But a good rav is and should not be "too busy" to answer any important "life" question such as the two that you mentioned.