Great addition. I think it would be best if this functionality could be implemented aside to the main action when the user uses cmd+c for OS X and ctrl for the other platforms. This would preserve the action property to open the URL or execute another action.

I'm not sure how Alfred structures this in their JSON schema at the top of my head but would need to look into it. I would figure it would be a property per result item.

A prime example would be the calculator plugin where the action could just open the native calculator app and cmd+c would copy it to clipboard.

okay.. hmm, I'll have to take a deeper look into it because I can really answer that :)
But what shall we do about this PR? discard it?

We'll keep it open for now until we have a better understanding on where to go with this.

Alfred's schema currently supports this through a text property in each item which you can define what will be copied. (reference)

I've just merged in the initial implementation of the clipboard functionality here: 7c13a0e.

This enables users to use the normal: cmd + c to copy an item into their clipboard. It would retrieve item.text.copy by default, and fallback to item.arg if item.text.copy isn't specified. An example is made in the calculator plugin.

Cool! looks like we can close this PR, then