INI meenie minie moe
You want to get under the hood? Opera gives you not only the latch release, but a full set of tweakery tools.
You can change the menus and the KEY COMMANDS to what you like.
Checkout the INI files in the directory where you installed Opera (or if you checked the box for Multi-User support, check the appropriate folder where your personal settings are used.
Make backups of the originals so when you screw something up you can fix it.
Make backups of your changes in case a later version of Opera over-writes them.
This is beta-test land. You can handle it. No whining.