Hi.
I've got 2 problems with your driver for my touchpad. I recorded a video for your convenience. The first one is when you touch a trackpad with your finger, the cursor starts to move with trembling (you can see this happening from the sixth to the tenth of a second). The other is when you scroll using 2 finger gesture and then stop, but your fingers are on the trackpad, scrolling starts to move with trembling again (13-40). Probably, these are bugs, but I don't know.
Dell Inspiron 3521, OS X Yosemite 10.10.5 (14F1509), Clover v2.3 r3300, Synaptics touchpad, Driver v4.5
Touchpad.mp4.zip