As far as I'm aware it's okay to mention the title of your book, as long as you're not "flogging it" or making it "all about you"; IE linking directly to your Amazon page, posting a blurb as well, etc... and you have a genuine question that relates to the specific book.
I call it the "Don't be a dick" rule.
Regarding your questions, borrows are listed in a second "Borrows" column on the sales report page. No worries about getting them mixed up.
My experience with Select has been extremely positive. In fact, I posted on Slashdot this morning (they had a story about KDP Select) and it had a lot more info, see here:
http://news.slashdot.org/comments.pl?sid=2659275&cid=38961449In short, at least for the moment, I recommend it.