Feature summary (what you would like to be able to do and where):
When editing, to be able to click an optional checkbox next to 'minor edit' before submitting an edit that makes it a 'proposed edit'. A 'proposed edit' differs from a normal edit in that it is not immediately applied and the submitter chooses a length of time for the proposal until it is automatically applied, from say 5 minutes to indefinitely. The 'proposed edit' shows up in the edit history like a normal edit, and other editors (probably just EC) can either revert it pre-emptively (giving a reason) or green light it to be immediately applied and bypass the timer (anyone can also revert the edit once it is applied, including if it was green lighted). The 3RR or 1RR would have to apply differently/ignore 'proposed edits'.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
I'm new to Wikipedia, most importantly this would address the issue of repelling/attracting new editors, which is critical to wikipedia's survival. It also can address the issue of edit warring somewhat. I thought of it when in conflict with another user after I made a bold controversial edit intending to follow WP:BRD.

Benefits (why should this be implemented?):
New editors unfamiliar with policy who generally feel uncertain and put off from editing can use this to gain confidence and seek approval for an edit, and the reasoning given by the reverter can be used to educate them about policy, facilitating master-student relationships on respective pages/topics.

This could become the convention for controversial edits, dismantling the binary of published and unpublished and offsetting the boldness, which can be received as an attack, reducing the chance of edit wars and polarised combative discussion, and encouraging collaboration.

This could also replace 'Protected edit requests' on CTs by making all non EC users' edits on these topics 'proposed edits' with an unlimited/indefinite timer.