Since I started using the crappy OS from vzw/rim I have to press the trackball several times to get it to work most of the time, but I have found that if I place the arrow on whatever I want picked, enlarged etc. And hit the curved arrow (next) in the lower right corner of my Tour it usually works as is I pressed the trackball once. You would think vzw/rim would have fixed this mess by now.
they have, just update your tour to the leaked version of .643. its by far the best os we have seen for the tour and it fixes the click issue and many other issues you are having.
Dont worry about waiting for it to be officially released. Do yourself a favor and update to .643. You wont have the click issue anymore, but you will have better battery life and faster browsing. Win Win.