Instead to have a static box for filling the Testlink Job Configuration, it would be quite useful if you could implement the dropdownlist for each field configuration:

Testlink Version
Test Project Name
Test Plan Name

Then choosing the Testlink version the field "test project name" will show the list of projects for that testlink version, and once you have chosen it the field testplan name will show the list of test plans for that test project.

Please find attached a couple of snapshot (only TestLink Version and Test Project Name)

Regards