What do you mean by a Tealium Extension?  Do you want an extension that allows you to load the Tealium TMS script through Launch?  If so, it can probably be built very easily but why would you want to load Tealium through Launch?

I think the suggestion above should work.  However, would you be able to add a cookie (lastVisitContainedPurchase) that tracks if a purchase was made. Set it to true during any visit where a purchase happens. Then on the first hit of any visit you would check the cookie to see if it is false and the...

Drop downs are harder to track than other elements. I have run into issues with different browsers and such when wanting to do anything beyond the very basic.  I think you will either have to post the code snippet for your drop down or will need to link to it here and show us what drop down you want...

Great question.  The difference here is that an Original Entry page is the Entry page from a Visitors first visit. Each time you visit a site it will log the first page view as the entry page for that visit.  This allows you to see which pages are pages drawing visitors to your site.  Though you may...