I agree with the checklist system, you should be able to check off symptoms, and mabye have a little spot where you can write out a brief discription of the fish's condition, click send and it sends off to a few people who have signed up with the check list who have a decent knownledge basis of common or even complex fish disease.
It'd look something like this...
Fish symtoms__________________________________Yes/No
Cloudy eye(s)?
Bloated/ing?
trouble swimming?
staying near bottom of tank?
red, vein like, lines on scale(s)/tail
open sore(s)?
cotten like growth(s)?
lathergic?
missing scales?
Missing appendage (such as eye)?
and whatever other symptoms anyone can think of.
Breif discription of fish(s) condition:
[Send] [] If urgent click box
now it'd send this off to whomever has signed up to help with fish disease problems and (hopfully, assuming the member is diligent checking e-mails) theres a response withing 2-10hours.
That or an automated system so theres no wait time. Aswell we could links that have all of the known diseases, pictures of fish with diseases, backround info on the disease, cure(s) if any and prevention methods.
As have been said, lack of experience has shown that aquarists sometimes wait till symptoms are severe before posting on here to discuss
Not to mention that the differences in time zones may cause a delay and people may not be able to respond in time.