There are two more books in the series, dealing with other characters (the second book is about Winslow! Fun!), but with Tyler and Karen making appearances. But both of those books are set in the same school year, so Tyler's still around. I think Book 2 is scheduled to come out sometime this fall, although I don't have a date for it yet. (It's called Playing Defense, and the Goodreads page, while not exciting, is at https://www.goodreads.com/book/show/2...). The third book is called Winging It, but it doesn't even have a page yet - won't be out until 2016, as I understand it.
I'd love to write more, including something that covers the issues you mention, but a lot depends on whether the publisher wants more, which will depend on how these ones sell. So... we'll have to wait and see!