[rules-users] Changing timer properties

Hi! I am working with drools (flow) 5.1.snapshot. I have a timer node within my workflow. Now I'm wondering if it's possible to change the timer delay property from outside, or at runtime in an action node. I tried to pass the delay-value as parameter to the process, and then set the new timer delay, but this approach didn't have any effect, unfortunately. Assigning a variable name as delay (eclipse-GUI-property) doesn't work either (value has to be a number!). It would be cool if it was possible to parameterize the timer node BEFORE process execution, therefore the process would be more generic. Has anyone a idea, how I can get rid of this? Cheers tom !