I edited your thread and moved it to the right place. The posting time limits for new users is an anti-spam measure. When you get some reputation upvotes the time-limit between posts will be reduced.
A similar request already exists for keyboard shortcuts.
Overwrite Existing Shortcut with Confirmation
I only have a few mouse gestures defined, but I agree that it would help for those with a lot more than I have.
0_1538591967803_Gesture Already Exists.png
This would be a lifesaver. I closed all other tabs by accident too many times when trying to close a background tab. And since I had more than 60 tabs open, more than half of them couldn't be restored because of the history limit.
To be clear, as of this version of Vivaldi, this would add an "Are you sure" dialogue for all these right-click menu options and the respective keyboard shortcuts
Close Other Tabs
Close Tabs to the Left
Close Tabs to the Right
Close Tab Stack (currently no keyboard shortcut, only available from right-click menu)
I'm coming here from Ability to re-open multiple tabs, after a bulk close. While I'd prefer that other feature be implemented, I agree this one is also good and would help me avoid accidentally bulk closing more than just 25 tabs, which can't be un-done since only 25 undo tabs are saved.