set Automatic Workitem Approval

I am just starting with extending our RTC server. I downloaded the SDK and started reviewing the following links:
https://jazz.net/wiki/bin/view/Main/CustomPreconditionFollowup
https://jazz.net/library/article/495/

What I would like to do is set properties/ set value automaticly to Approvals WI

the scenario
1. create extension to the com.ibm.team.workitem.operation.workItemSave operation ID to get the user WI,

2. create java program which can get user who must approvals from LDAP, the Data from WorkItemSave Operation ID.

3. Set Properties /set User Approval to WI tabs Approvals, the data coming from LDAP.

Is it even possible?