Hi, there could be numerous use cases for this, the ability to copy-paste event line gain from one event to another.
My current use case, was to work around a bug/protocol problem of using ARA2/SL on events with line gain already:
Event Line Gain Renders With SL/“Make Extension Permanent” but still shows Line Gain - Cubase - Steinberg Forums
The simple ability to copy/paste line gain would have saved hours of work preservation.