Hi,
You could use the script module and just add to the path that way.
But the module is this way for a reason. To me, I want to take control of exactly what is configured on machines. So when I look at my playbooks I can know exactly what the PATH is set to on all machines that the playbook applies to.
Perhaps you are trying to acheive something where this needs to be different on each machine though?
What is it you need to do?
Jon (module author)