Problem: Per w:WP:DRAFTNOCAT (and equivalent policies and guidelines at other wikis/language editions), draft pages are not supposed to be placed in article categories. However, many newcomers are unaware of this. Further, many experienced editors choose to ignore it. As a result, volunteers have to go around regularly manually disabling categories on drafts.
Proposed solution: This task could be integrated into the software. In an ideal application, all categories in a draft would be automatically wrapped in the draft categories template by the software, without the need to do anything to the wikitext. Exceptions should be made for Category:Wikipedia drafts and its subcategories.
Who would benefit: This would eliminate a task for patrollers, reduce confusion for newcomers, eliminate the chance readers come across a miscategorized draft while browsing categories, and allow for easier category work on drafts for all editors.