Version 3.5.8
Under Tiger, some of your transitions may have edit-able parameters.
To edit these parameters, select "Edit Transitions..." from the Transition menu popup.
The transition editor looks like this:
Modifying a Transition
Select the transition you wish to edit from the popup.
Modify the parameters to the right as you see fit.
Each transition will have a set of its own parameters, which any third party developer may add create. It is beyond the scope of this documentation to describe all possibilities.