Hi,
The problem with the standard controller is that it accepts Inputs as the one defined in the Input Manager, that is joystick, keyboards and mouse inputs. I do think this is a very bad system, as not only it doesn't let you take in account even basic touch events, but on to pof that it doesn't let you work with with script...
So, we are left with three variants:
1: you want to keep this controller. you will have to edit the controller to accept other inputs, this is trivial infact, you simply need tweak the code where it checks for input and add on top of it a variable, which would be tight to the joystick outputs.
2: You download the penelope tutorial and use the controller defined in there, you have a great range of possibilities, as they give you three type of controller: Camera relative, player relative or tap control.
3: You are allergic to scripts, then you will have to code the character controller all in playmaker. This is totally feasible, but will definitely be a big task.
Bye,
Jean