This worked, thank you for the pointers! I was able to pair the RGBGenie ZB-1005 RGBW Controller to SmartThings, and to pair the RGBGenie ZB-5008 RGBW remote to SmartThings, and then link them together via TouchLink.
My steps were:
Factory reset the Controller by pressing Program 5x.
Within 5 minutes of factory reset, perform a SmartThings “Add->Scan Nearby”, this added the controller.
Factory reset Remote by press-hold the Power button till red light is solid, then press power 5x.
Pair to SmartThings by press-hold the Power button till the red light is solid, quickly put SmartThings into Add->Scan nearby mode, quickly press S2 on the remote.
The remote shows up as a Thing.
TouchLink the two together:
Cycle power on the controller.
Within 5 minutes after power cycle, on the remote press Power. Then press Zone 1. Press-hold Power till red light is solid, press S2, place remote <10CM from controller, and wait. Both the remote the the RGBW lights did some blinking, and presto.
I can now control/automate the RGBW lights via SmartThings, control the lights via Remote, and control the lights via the remote even when SmartThings is turned off.
This video shows you the steps, you just have to SmartThingify them: Zigbee RGBW LED strip Controller and remote control - YouTube