Hm... I think that situation is wanted, because there aren't so many different tasks to talk about in the same topic and you don't have to use the quote-function all the time for talking about another task again. It is much more clearly arranged this way: An own topic for every task! The only problem is that the users don't use other titles instead of the standard "Re: <topic>". So perhaps the title should be empty from the beginning on, so that the user is forced to enter a more specific title.