So, essentially, what you're saying is that you know it has already suggested, but you want to do the same thing to get credit?
Congratulations, Sir, you have learned:
Politician Skill: Bask in the Glory
Take credit for someone else's idea.
Anyways, ignoring your blatant disregard for spelling, what you're saying is that diseases should be randomly generated, like titans and forgotten beasts. It's a sound idea, and would be nice to have moddable raws that you could put different diseases in, such as this poorly written example.
[DISEASE:COBBLERS_MOUTH]
[C:MIASMA=1]
[E:EXCRETE_BLOOD MOUTH]
[E:ROT MOUTH]
Cobblers Mouth is caused when a Dwarf is near Miasma. It causes his mouth to rot, and for blood to pour from his mouth.
It would be nice if you could specify the disease, which races it affects(Here we come, Elven Madagascar!) and the symptoms it exhibits before it comes serious.
Another idea would be for randomly generated names for these diseases, like "Shrivelroot" (Guess what that does!) or "Goblinbeak".
Finally, it would be really nice if you could import or make antidotes from plants nearby, that would cure it if the dwarves realize the symptoms. You would need a high skill herbalist, and you could make it in the Alchemists Shop or Farmer's Workshop.