Probably not. Since we don't have user accounts, and already have a bit of a spam problem, I'd be pretty worried about what a real POST API might bring.
I figured as much. Just wishful thinking on my part--it'd be nice to be able to build a client wholly atop the API.
It's not like the html form does anything special. Forms don't have funny markup you have to scrape or produce. It's just a POST.
I guess there's mime/url encoding or whatever, but that's hardly an issue.
There's a captcha
What if you charged for it? (Not saying this is a good idea, just that it's an idea.)
Charging for spam just means spammers buy accounts to post spam...