i agree 100% with what you said in your paragraph regarind caravan time. but this sentence is probably where you hit the nail on the head. i'd bet (and i have no actual information to back this up), that it is in fact an insurance consideration. heck, why even be qualified in a multiengine plane at all, in the overall scheme of things? f16 guys can get hired by majors, and there is only one engine on those. so i'm sure it's an insurance thing that is just easier to draw a very hard line somewhere and not look at someone's "specifics".