Yeah, I think the JavaScript for that is in clientscript/vbulletin_quick_reply.js, and it looks like it clears that checkbox if a post wasn't selected. So I guess one way is to figure out how to change or add JS.
Another idea might be to rename that checkbox so the JS won't mess with it, then use a plugin on newreply_post_start to read the value of the checkbox and fix things up on the server side.
|