[galaxy-dev] Dynamically create Workflows

Hey, I wonder if it is possible to let a self-written script, dynamically create workflows. The idea is to create a pipeline, by providing the user a kind of analysis webpage where he can select a certain set of tools and parameters and the output of this interface should be a workflow. And another question. If if have a workflow consisting of a set of tools, will galaxy create a single cluster job consisting of all tools, or one job for each tool and the run them sequential? This would be important if one script pipes directly to another. Thx, Michael :-)