Hello Joel and thanks for that.
I have not persevered with the 5.8.7-beta4 release, because :-
1) The standalone installer download always gives me a zipped folder which Windows XP claims is corrupted or invalid
2) The installer version messes up my XP's right-click context menus, in that right-clicking anything causes the system to hang requiring a forced reboot every time. This appears to happen regardless of how I set any Eraser Preferences.
It does seem however, as stated by earlier posts in this topic, that the 'when finished' setting is indeed retained in an On-Demand Eraser task, although I have yet to find out if it actually works. I had forgotten or previously not noticed this, seeing as the release messes up my context menus, meaning I then just decide to remove the install completely without persevering.
Does the latest version 6 Eraser release work better, regarding both the 'when finished' issue and the right-click context menu issue?
I haven't bothered to properly check out version 6, out of concerns that the efficacy of the wiping/deletion is apparently not yet verified.