1 & 2 are both in Folder Options (Or in Folder Formats if you're looking in Preferences.) Folder Formats: Quick Guide has the steps for making the changes for all folders, if that's what you want.
3 is so unrelated it would be better in a separate thread, but while you can jury rig automatic background synching using Opus commands and script add-ins or Task Scheduler, you're probably better looking at a proper background synching or backup tool to do that job. Opus isn't really designed for it, and automated background synching (and conflict and error handling, and problem reporting, without getting in the way or also without losing data and not telling you) is a hard job to do properly even with tools which only try to do it and nothing else.