Unsupported.Why? because this idea is simply not going to increase role-play at all. Fireman job is a job of roleplaying, not only collecting money. In my opinion, you should co-operate with your team-mates instead of doing the mission alone, and without any script support for that. Firemen should be team-workers, they have to work together in-order to finish the objective.
Also, fireman job is not for money as many players think. It is the best job for roleplays. It does not require anything rather than just some ideas about the job and role-playing it. Adding scripts to allow you to reach the mission in time to get the money will simply kill the whole Role-play in the job.
I hope fireman job improve and it's firefighters start doing some roleplays during the objectives/missions instead of just doing what they usually do (Arrive-Countrown-Go-Goodjob).
The server is a role-play server. You should role-play whenever you get the chance to.