hmmm... then I don't understand your problem correctly (I think) 

Let me summarize:
- one task per tasknode and a fork 
advantage: you can have a generic page which shows only the transitions for 
that task(node).
disadvantage: write code to cancel other task

- two tasks per tasknode and no fork
advantage: other task is cancelled if one of them is acted upon (no code)
disadvantage: create custom page per task

I'd go for the latter and imo there is more than a little difference. A custom 
page will be very easy with jBPM 3.2 (one copy action and one delete (of one of 
the transition buttons) You could even make one page with a dynamically visual 
buttons for taking the transitions.

Cavalera: the node leave is to late in the handling of the action. One is 
already selected then, so all you can do is throw an 'not-allowed' exception 
e.g. and handle that in the page. Not an elegant solution.

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