Comment 8 for bug 704778

In Maverick Netbook Edition a single click was sufficient for switching workspaces. In Natty this changed to double click, which is very annoying. My MacBook has no separate keys for clicking, you press the whole touchpad down for doing a click. Doubleclicks are very hard to do this way.
This issue is not yet fixed.

And one big wish to all developers: don't change every behaviour in every relase of Ubuntu! If you wish to change a behaviour, make it configurable.