There should be a /ghostoff command.
It's really good for joints practice and you
can learn more properly how your joints works.
It's kind off annoying that you have to keep
press b..

How is pressing b more annoying than typing /ghostoff

You only have to press /ghostoff once. And then obviously /ghoston

But, you have to keep pressing b under the whole match..

Well , it's because you can accidentally hit your hand\elbow on b, and your ghost is deactivated.
In my opinion, I like this suggestion.

~ Supported.

Hey, I implemented your idea as a small script. You can find it here.