Then, maybe we should go another way,
by modifying compiler and if it finds selectors #fork, #forkAt: used
in code, then
it shows a big red warning which says:
- this method using forks, please check your code twice against
concurrency issues before submitting code. Presse 'yes' to continue

and after user pressing 'yes', shows another:

- are you sure you still want to accept code which using forks? Press
'yes' to not accept this code.

:)

-- 
Best regards,
Igor Stasenko AKA sig.