Hello,while the 6940 is active but no phone calls, the only softkey that appears is the "Redial" key. Can these softkeys be changed? For example, can I add a DND button to the softkey row? Also, if I pick up a call, the options I have in the softkey row is Transfer, Add User, Push Call, and End Call. Am I able to add additional softkeys there? I have empty slots available.