Seeing as how many illegal proposals that weren't drafted on the forums are submitted to the WA, I think a warning should be added after clicking the "submit a proposal" button and before you can choose which council you want to submit, that says in big bold, maybe red letters, something to the effect of:
"A World Assembly proposal has to follow many rules to be deemed legal. Make sure you understand what makes a legal proposal first. Writing a successful World Assembly proposal almost always requires a drafting process. If you are submitting a proposal without any feedback, we strongly suggest you to go to the General Assembly forums to post your draft and seek feedback."
And then maybe add a button underneath saying "I understand" to proceed to the next part.