The idea is:
I would like to always have the download button available to download the full data set from a node.
My use case:
We have a download button when the data is to large to show. However, often I have the data already nicely structured in items and I would like to do some debugging. For this I need all records and search for some specific records for example. So I want to extract the items and process them somewhere else, in vscode or another debug flow.
When I set to it show all records it cannot handle it when too many items are there. But there is no download button to simply download, like there is when it would all be in one item for example.
I think it would be beneficial to add this because:
Debugging would be easier 
Are you willing to work on this?
If you tell me exactly where to go I might be able to do it, but I am not familiar with the fron-end code of n8n really.