HI,
We can let our developers to work under a single request by various tasks. But while transporting, you have to unlock the objects with the help of http://scn.sap.com/docs/DOC-31394
The developer has to create a new BEx TR in RSA1-->Transport Connection-->Bex truck-->Standard Bex request-->Double click on the blank box-->It will allow developer to create new request-->they just need to enter the Transport description.
Please double click on Request/Task in the package below. It will show you the request which you created just before. Then all the objects which belongs to that developer will be collected under this new TR. You can see green light.
Regards,
Suman