Resourcing

Hi all.

There's a faq entry answering the question 'how can I schedule the same 
resource for two tasks at once'. I want the answer to the opposite 
question 'How can I stop mrproject scheduling the same person for two 
tasks at once'.

In other words, if I create two tasks and assign the same person 
(resource) to work on both of them, is there a way to force mrproject to 
schedule the tasks one after the other, rather than at the same time?

I know I can manually do this by linking them. But if the two tasks are 
really independent, until I assign resources they should be scheduled at 
the same time. As soon as I assign the same resource to both of them, 
they should be scheduled one after the other, as the same resource can't 
do two things at once. Or at least THIS resource can't.

Thanks. Good looking program by the way.