Currently mediawiki auto-merge edits on edit conflict. It would be more useful if it was possible to specify what should happen, for example there could be variable
automerge - would do what it does now
fail - would return an error in case there was any kind of edit conflict
overwrite - would ignore all edits of other people and would overwrite the page with new content
This is useful for things like antivandalism tools which need to deliver a message to users based on current content of their talkpage (the warning template level get adjusted based on templates currently present on the page). When two users post in same moment, the edit conflict get resolved by merging both messages, that have same level. Being able to fail on edit conflict would allow tool to redownload content of talk page and parse it again.
I believe that other bots / tools could use this as well when they edit the page based on current content of a page. Especially bots that are doing similar tasks.