Integration with Action module

Hi,

I tried usiong the workflow module with action module.I assiged the roles in action modules for particular actions but when I assign that action in workflow module,that is not showing any effect.I mean action module is used with workflow module but these two are not very well integrated.And I beleive there is only one default action(Send Mail) provided with Action module.And if I want to change authors of 4 different nodes to 4 different users,it is not possible here.
Like,
Action:User
1)Verify Forms:Clerk
2)Inspect Site:site-engineer
3)Accept Payment:finance-dept
4)Final Approval:engineer
Above are 4 action need to be performed by 4 different users after each action happend.Like
VerifyForms->Inspect Site->Accept Payment->Final Approval.
This flow we can specify in workflow module,but the flow follow user roles also.
.This I tried a lot but didn't get success.
Ultimately,I want http://drupal.org/node/17465 to be implemented using action and workflow module.
I am attaching my efforts.........
Please try to add this feature,if it exists then guide me to implement this.