When editing a JavaScript file it would be nice to have a 'save and continue editing' button which does not reload the page? It would immediately save the script.
It would save the file on server, but then if I want to resume editing, I don't have to click 'edit' again. It would be suitable for editing drafts of scripts and checking how they run before I finish updating them.
removing Editing-team as it's up to each team which tasks are supposed to be on their board
Using Extension:Drafts is indeed similar, but there is one difference: saving a draft perhaps does not allow me to test how the current version of the code runs. Hence the "and checking how they run" remark in the original submission. That's the use-case it is intended to address -- someone is developing a JavaScript gadget or user script on-wiki by making incremental changes to it and testing its behaviour on another page.