This is pretty abstract to me (plus I'm afraid that the user interface has changed a bit in the last six years); for example which scripts need to work with what exactly?
Can concrete examples be provided, please, so we can discuss real usecases and avoid misunderstandings?

I think that tools like Twinkle are already far beyond what this originally intended to target.

The original request was basically to show (a fragment) of the content on Special:Delete, in order to simplify the assessment of what would have to be specified as the deletion reason.

By default this is available as "MediaWiki:excontent", which is prefilled as the "other" reason in the deletion reason summary. This however led to much carelessness and very inaccurate deletions, as well as the log sometimes containing fragments of what was supposed to be deleted. By default was therefor disabled inside en.wp, but this caused the problem that the sysadmin has less visible 'context' than before.