If you use a text editor for that, the listings are "CrewRating=x" lines, where "x" is from "0" (zero) to "4", with 0=Poor, 1=Novice, 2=Competent, 3=Veteran, and 4=Elite. Doing editing for these would be daunting to say the least if using the Mission Editor, though it is certainly possible.
If you use something like
Notepad++ or
010 Editor (costs money, but highly recommended for chores like this for its scripting power), you can do a search to find all occurrences of "CrewRating=", and decide how much editing you want to do... As an example, in the Stock game, there are 3383 "hits" for "CrewRating=" in Campaign_RND.mis, of which none are set to "5", 802 are set to "4", 733 are set to "3", 924 are set to "2", 358 are set to "1" and 566 are set to "0". Depending upon the mod(s) you are using, these figures will be different, but you can see in stock that the devs didn't want to scare-off or frustrate folks with rammings and depth charge attacks...
