Customizing phone user interface

[mdu113]

Hello,

Is there a way to customize phone user interface?
There are features accessible through user interface that I don't want my user to play with or even see.
For example DSS Keys settings. I don't want my users to see or play with it. Also local call forwarding. All forwarding in my system is done server-side and I'd like to hide that as well.
Also I don't use Broadsoft. Is there way to hide Broadsoft directory option?

Another ugly thing is whenever I pick up, let's say line 1, the top line of the phone display shows line 1 auth name. Why on earth it shows auth name (which in my case is cryptic set of digits and letters) and not the line label is completely beyond me. Hopefully it's a bug. I wonder if that can be changed too.

The phone model is T38G with the latest firmware.
Please let me know if something can be done about these user interface problems.
Thanks,

Michael