What I know is that, for example, the same SCOT can be integrated in two different interfaces. See SPT, linked to both Splintertalk.io and to the SM forum. Actually Scotbot distributes rewards to all posts using the relevant tag, but I believe you were interested in the first situation, where two or more different interfaces distribute the same token.

I know of at least a public case where work is being done to integrate SCOT into a non-Nitrous website. That is D.Tube. Announcement here: https://steemit.com/scottube/@aggroed/steem-engine-and-d-tube-are-partnering-up#@aggroed/psjli2

I hope you will receive answers to all your specific questions from someone who knows the system from the inside.