Turns :12 + X turns for sailors affected % up to 20 turns
Target ship or fleet ID ( not decided)

Scurvy spreads among target fleet/ship crew. Target ship/fleet loses X% of its crew where x is 10% for every 5 turns used

This was suggested before.

You suggest a lot of voodoo that we cannot keep track of suggestions. May be Captain Jack can create a suggestion list with status :p

That would be nice, Phoenix. I'd like that.

Anyway, Grimrock is right. Similar suggestions have been made before. If I'm not mistaken, Captain Jack even responded that voodoo which killed crew were not gonna happen. I don't recall the arguments for why not right now, though.

I made a suggestion just like this once.
viewtopic.php?f=16&t=2188&hilit=scurvy&start=10
that also explains why it can not be added.