I have touchpad E501 too. All you need is install AppleSmartTouchpad.kext. Almost all features working for me:
- Lookup: tap with 3 fingers
- Right click: tap with 2 finger
- Left click: tap with 1 finger
- Zoom(Smart zoom and rotate not working)
- Launch pad: pin with thumb and 3 fingers
- Show desktop: spread with thumb and 3fingers
- Scroll with 2 fingers,
- Scroll at right side with 1 finger(default of ELAN lol)
- Swipe with 2 fingers from the right side: Notification
- Swipe with 2 fingers in launchpad
- Swipe up with 3 fingers mission control
- Swipe down blabla
And you can custom the gestures with BetterTouchTool :3 Have fun