So one issue I have is that I occasional have to lock a thread, while people may still be about to post in it, unfortunately those posts can become lost if they happen to try to post or refresh the page after it's been locked.

I would appreciate an option to allow certain groups to still make a post X minutes after a topic has been locked.

For cloud, we may be able to do this by the realtime system to see who is on the page and actively using the editor.