I don't know whether the specific capabilities you want to use are supported by the Synaptics driver, but have a look at
and see whether there are any options listed there that look relevant.
If you want to include any of those options, you can copy the default configuration file and edit it: first, do
$ su -c 'cp /usr/share/hal/fdi/policy/20thirdparty/10-synaptics.fdi /etc/hal/fdi/policy/touchpad.fdi'
then edit your new touchpad.fdi with
$ su -c 'nano /etc/hal/fdi/policy/touchpad.fdi'
for example to include those options.
Each time you edit your fdi file, restart HAL with
$ su -c 'service haldaemon restart'
There could well be an easier way than all this, but that is what I have done in the past to alter properties like tap-to-click. In any case, I hope that gets you started.