All. I have seen plenty of videos of folks using a sram shifter as a dropper lever. I tried to convert my son's tiara lever this weekend and darn if that did not go super well.

Anyway have any specifics on how to setup a shimano shifter to be a dropper lever?

I removed the little tab that drops into the rings and by doing so I actually removed the ability to actuate the cable. Ooops.