This was the biggest drawback when I was considering a Dell Mini Hackintosh...but no longer. I did an upgrade to the DELLEFI 1.1 then install the "install 2 finger scroll (not recommended)" option.
1. Install using just the Easy Installation; reboot (if you are upgrading, you will be prompted that some files will be removed and upgraded)
2. Installing using the Custom Installation; choose only the "install 2 finger scroll"; reboot
Obviously this is just experimental and found a couple flaws (if it starts flickering between icons when resuming from standby, just press the ESC key) but the majority works...not as pretty as the Mac version but functional. Give it a try.
Also, seems to work best when you hold down with two fingers then scroll then use a rocking motion to scroll.