I think it would be nice to be able to clone / duplicate event sheets in the editor. Of course someone can copy-paste the events if needed, but for specific tasks it would be nice.
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Out of curiosity, why would you want to copy/duplicate events when you can include one event sheet within another?
I can think of only one situation: When someone has to make a different event sheet based on a previous one.
or move an event sheet to another project.
I imagine that when includes, loops, functions, and families, are used effectively, needing to duplicate and alter events would be very rare. The only time I've needed to duplicate and alter events is when needing to perform the same actions for multiple object types. I'm hoping a primitive object model is used in C3 to get around this, but I'd be surprised if it were.
That would also require having the same objects in the other project as well. I'm not saying it's a bad idea, but what you're asking for is modularization, which appears to be a goal for C3.