Accidentally starting new game on mobile, in bullet tournaments

Is it possible to have some delay of dialog box after finishing game, or some other option so when I have finished the game to avoid accidentally starting new game.
Probably I am not the only one with this problem.

And it is really annoying, especially when I lose :)

nobody?

I did not understand your question.
To start another match you do not need to request a rematch, accept an opponent's rematch request, or click on the "new opponent" option.
Just do not click on any of them that a new game will not start, as far as I know.

But I play only by the computer. I do not know if mobile is any different.