Wikipedias in some languages, among them Polish, Russian, Ukrainian and Hebrew, have a gadget that shows a list of frequent edit summaries near the edit summary field in source editing mode.
Here are the source samples:
Polish: https://pl.wikipedia.org/wiki/MediaWiki:Gadget-edit-summaries.js
Hebrew: https://he.wikipedia.org/wiki/MediaWiki:Gadget-Summarieslist.js
Many users in the Hebrew Wikipedia complained about the lack of this gadget in the VisualEditor. This could be an enhancement request, but given that for several languages it's an integral part of the editing interface for these languages, it's a regression for them.
Adding this as a feature should be very easy, given that it's quite simple and the existing gadgets' code can be reused. Localization and customization for every project can be done on a MediaWiki page with a list of summaries for that project.