I finally found a good use for 'Archive' ...
Set it to auto-delete every 24 hours and when you have an email that you are sure you won't want to keep (spam, chain letter, jokes, etc.) just click 'Archive' and it will be removed from the system in 24 hours.
I can't set 'Trash' to auto-delete because occasionally legit emails get filed there by accident, like today!
It would be VERY helpful if each e-mail showed which rule caused it be filed into a specific folder. We can see the spam score, could we see the spam RULE as well?