If scrolling works, then tap-to-click must also work. I suspect that it's a configuration issue and that tap-to-click is simply disabled in your distro.
Open a terminal and type,
Code:
synclient TapButton1=1
Then test to see if tap-to-click is working.
Report back here and we'll see what we can do to make it permanent. (also, let us know which distro you're using)