Do you thing it is something worth to implement?

Not globally. The current behaviour is the one I expect, even if it is unintuitive for you.

I would also tend to argue mildly against 1-click voting: it becomes too easy to click by mistake (or indeed too soon where reading a reply afterwards might cause you to re-evaluate your vote) and if a monk wants to vote on a lot of nodes on one page then that results in more round-tripping to the servers than just submitting the whole form once as is now the case.