Firstly thx for this beautiful browser! I used to use Opera and loved it. Because its mouse gesture is built into the browser, the feeling of using it is just better than any implementation by extension. Vivaldi's built-in mouse gesture is good too. there is still a lot to do. Will it be improved in near future??
It's likely to be continually improved until it's at least as good as it is/was in the browser that introduced mouse gestures lo, these many years ago.