We have a mechanic for building reusable components using custom events (and entity-aware custom events when eca_content is enabled). This mechanic brings in two possible problems:
Have not marked this one for stable release 1.0 as this issue is somewhat abstract and not a concrete use case. It's just an idea that came up while building ECA VBO → where ECA configurations are being exposed as bulk operations.
We could provide a mechanic to expose ECA configurations as "callbacks", and offer an action that allows to select available callbacks from a dropdown.
The term "callback" includes "back" which means this mechanic should also provide an intuitive way how to get a return result.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.