I would like to see these 3 features in some next build:
- option to sync my speed dial with copy from my Sync (I want that Opera ask me if I want to populate speed dial from my account)
- option to Opera install my preferred apps on click from my Sync list
- option to Opera copy my preferred settings from Sync
That would be great if I reinstall OS or I change PC so transition would be painless 
Also You need to fix playing videos in Linux because this is nightmare. Please see how Brave browser is fixed this problem with Widevine installation. Browser displays question if I want to install Widevine or something like that so I can watch videos and if I click Yes he is doing the rest. And after that everything is working like a charm.
Because of this problem I cant use Opera as my preferred browser on Elementary OS