Add an uninstall feature that allows the user to save their changes to the default avast! settings. This will eliminate the need to waste time and have to manually modify the default settings after an uninstall and re-install.
The same, but a little more flexible I think, would be keeping the defaults and add save/restore personal options/settings.
sounds like one of the best ideas which ever came up here! 
Lots of times.
Personally I wouldn't include the export settings into the uninstall function, it should be available from the avastUI 'Export user settings, etc.' along with an 'Import user settings' option.
If it were in the uninstall function, there would still have to be a corresponding option to 'Import user settings' or there would be no point in having the option in the uninstall function. So if it is available in the avastUI, essentially it would be redundant in the uninstall function.
As for the manual scan shutdown option, I have seen many forum topics where even the scheduled scan isn't shutting down after the scan, something is obviously preventing that. That said, I honestly can't see the need for a shutdown after a 'manual' scan after all you are present.
Scans generally don't take that long unless you are setting up a paranoid custom scan, so the Quick scan shouldn't take that long:
- With a resident on-access antivirus like avast, the need for frequent on-demand scans is much depreciated. For the most part the on-demand scan is going to be scanning files that would be otherwise be dormant or inert. If they were active files then the on-access file system shield would be scanning them before being created, modified, opened or executed.
I have avast set to do a scheduled weekly Quick scan, set at a time and day that I know the computer will be on. If for some reason my system wasn't on, no big deal I will catch up on the next scheduled scan.
