2) What type of subordinate clause is the one in bold? If you analyze it as subordinate, it is an adverbial clause of concession. The paraphrase in that case is:
I could talk for hours about the effects of alcohol, alt
I had a feeling the type of clause this is was slightly inconcspicuous. I even considered re-phrasing as you have done, but I was unsure whether this was acceptable. Now I know