good idea, i have the same problem.
everyone on my block thinks i am mr. fixit. i don't use my truck for jumpstarting duty unless an absoulute emergency. just a little leary of doing damage to the computers or the charging system.
my truck has a second battery, when the key is off it is completely isolated from the rest of the electrical system. i would use that instead of the main battery.
a guy at work jumped his ford backwards this last summer, hasn't run right since!
more often than not, i just loan people my battery charger. or use the jeep for jumping.
you call them ferrets, i call them weasels.