Ok... well I went and experimented with a trackpad this week. A Logitech T651 track pad to be precise. I'm having the exact same problems with the trackpad as the mouse! Could it be my onboard bluetooth is too old, and needs to be brought up to 4.0? Maybe with some type of USB dongle? OSX 10.11.5 iMac (21.5-inch, Mid 2010) iMac11,2 3.06 GHz Intel Core i3 16 GB 1333 MHz DDR3
Apple Bluetooth Software Version: 4.4.5f3 17904
Hardware, Features, and Settings:
Name: iMac
Address: 78-CA-39-CA-27-F0
Bluetooth Low Energy Supported: No
Handoff Supported: No
Instant Hot Spot Supported: No
Manufacturer: Broadcom
Transport: USB
Chipset: 2046
Firmware Version: v208 c518
Bluetooth Power: On
Discoverable: On
Connectable: Yes
Auto Seek Pointing: On
Remote wake: On
Vendor ID: 0x05AC
Product ID: 0x8215
HCI Version: 2.1 (0x4)
HCI Revision: 0x206
LMP Version: 2.1 (0x4)
LMP Subversion: 0x21D0
Device Type (Major): Computer
Device Type (Complete): Mac Desktop
Composite Class Of Device: 0x380104
Device Class (Major): 0x01
Device Class (Minor): 0x01
Service Class: 0x1C0
Auto Seek Keyboard: On