<$button message="tm-new-tiddler" param="TaskTemplate">New Task</$button>
To extend Scott's suggestion you make the button visible on the view template and then set one or more values based on the current tiddlers field values.
locationContext={{!!locationContext}}
Thus clicking the button will create a new task based on the current tiddler.
I call this process setting the context. Personaly on my main organiser wiki I set domain, project and sometimes client values on every task, note etc... Domain is work/personal etc..
By having the new button on the tiddlers I only need a single click to make a related item.
I may package this one day.
Regards
Tony