The feature is there, but not documented properly - you can grab the instance of the context menu through here and customize it:
Posted on:22 Apr 2017 17:34
Any progress made toward this?
Posted on:08 Nov 2016 05:23
Yes; this sounds useful! We need more spreadsheet events exposed!
Posted on:19 Oct 2015 16:33
It should not only exist for single cells but also for cell ranges.