General:
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I think we have some performance improvements to sync in the pipeline, although doing massive syncs is not really our focus; there are dedicated tools for that kind of job which you can integrate into Opus and which may be worth looking at if you need that type of thing often. Beyond Compare is a good and inexpensive one which we use ourselves, but there are lots of other options, including some free ones.
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You can set the options ahead of time via button/hotkey/command arguments.
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The progress dialogs can't predict the future. They're good for the normal case, and vast majority of operations, where every file is being copied/moved. In other situations, the totals won't be as good as lots of the files will end up being skipped. But they don't know that until it happens, and working it out in advance would just make things take longer (and could still end up being wrong, since things can change during the copy).
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Not sure what you mean there. The image conversion tool does have a UI. Maybe start a new thread with examples of what you have in mind.
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For crashes: Automatic crash logs (for bug reports)
For hangs: Manually generating process snapshots
If you want to follow-up in more detail, please start a separate thread for each thing.