I'd like MediaWiki to have the option to show in-line edit history, including the option to show you which particular user has added or last edited a particular text in the article by for example hovering above that text online.

Ultimately, I'd like MediaWiki to have the option to apply a background color to the text that depends on the reputation of the user who made the last edit to the text. For example, text that was last edited by a user who has frequently been banned from editing should have a red background, and text that was last edited by an adminstrator should be colored green (or blue for the those who are red-green colorblind). This would quickly give a hunch about reliability of the text as well as the potential need to improve it.