+1
I don't see the reason why not.
I personally never used the /fix command, I always paid for it myself but at the same time I see a lot of people complaining how someone crashed into them, broken their cargo, trailer and so on, therefore I see how this would benefit some people.
At the end of the day, if you don't need it - don't use it
EDIT: Maybe limit it's usage? once per hour or so