It would be great to be able to set two channels.
We’re really sorry that several sources are not supported now!
However, I can suggest the following workaround: please use links to particular videos as sources, this way the widget will be able to display the videos from different accounts.
Anyways, we’ll try our best to consider this suggestion for our future updates 
This is currently a HUGE limitation, namely that you can’t post multiple showcases. This is more of a bug than a future feature. The workaround is not acceptable.
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Hi there, @user174 
Thank you so much for the feedback!
We are really sorry that the current limit doesn’t fit your case. We’ll try to consider this opportunity in the future updates, especially if it gets more votes.
The good news is that we have a Social Feed app, where you can display multiple Vimeo Showcases. Feel free to try it out 