It's not about clicking mouse once or twice. 
It's all about adding cool intelligent features to make Mp3tag even better. 
The program cannot and shouldn't do everything itself but IMO whenever possible it should make the best choice for the user: strip unlikely wanted leading zeros, try to guess the name pattern, etc. That's what is 'smart' software, not just 'usable'.
However, I admit the author might have another plan on his mind.
So I don't insist.
It was just a proposal for consideration. 