I agree it would be nice to see that ability to add 4 or so crew to units like rescues and ladders. Not all departments in the US run full crews on all trucks there are a lot of smaller companies or volunteers that don't run that type of staffing so leaving the minimum to 1-2 and raising the max to 4-6 would be nice.
PS: I do believe this post would be better placed under the suggestions tab not general discussion.