double click the tab area and you get a new tab. ctrl-n gets you a new tab. i personally wouldn't ever use that feature.

I like the extra modes of copying since they all have unique uses and prevent editing in cases.

the encoding bit is odd yeah. adjust scrollback is not a common option i suppose.

it would be nice to configure the right click menu more but that's not an option i see in many apps so it's a wash. I use the menu so i don't have those options. it may even be configurable via a file somewhere in .config... i haven't tried or been bothered by the defaults enough to do so.