ugcheleuce, your suggestion inspired me-- someone rarely inspired in the cyber-realm!-- to not just follow your recommendation but to add to it in order to make it even more effective at achieving my objective! So I googled "How to customize keys in Opera" and followed the instructions. I wanted to reduce the effort required to conjure up the Downloads list, so that instead of having to use two keys-- Control + J-- I added j (WITHOUT the Control key) as a Downloads list shortcut. But then, when I wanted to create another one-key shortcut to instruct the computer to close the Downloads list tab, I ran into a problem. First I designated k to be that key-- but it didn't work. Then I tried l, but again it didn't work. Why? At first I was mystified, but then I noticed there was a box on the Downloads list page "Search Downloads" and the k and then the l were simply appearing in that box. So I then looked for a suitable Function Key-- one that had alternative ways of achieving whatever that Function Key did in Basic Shortcuts-- and I selected F8. First, I X'd out F8 as a shortcut for that purpose in Basic Shortcuts, and then typed F8 in as an additional shortcut for the Close Tab command. I immediately tested it out, saving a page on Opera, and then, after a while, pressing J to make the Downloads list appear, and then F8 to go back to the prior tab. To my slight surprise and utter delight, it worked perfectly. So thank you ugcheleuce for your marvelously helpful post-- you make my craving for what Chrome does to be incorporated into Opera even less urgent than it was-- although I still wish it were so. And, hard as it is to believe, I'd never before customized a shortcut--and its reversal-- and it's really interesting (and satisfying!) to see how easily a mere vaporous desire can be converted into a concrete reality with a few properly directed clicks and keystrokes!
leocg, how often do suggestions left in the Suggestion Box actually lead to a change in Opera? (I hate doing things that are destined to almost certainly prove futile!)
By the way, leocg, I followed your directions re how to Edit Preferences in order to receive an email notification when someone has responded to a post, and it worked-- but only once! Four of the five comments that have been posted in this thread since I made the change-- including two of three of yours-- have not led to notifications to my gmail address! Isn't that a surprising malfunction of the Opera notification system?