Thank you Gandalf and Tom for your comments. Yes I believe that the USB SCPI commands aren't going change this to a DM3068. I never had high expectations for it, but I wanted to give it a shot. The DM3058 firmware wold need to modified to do the job of getting 6 1/2 digit display, and that is beyond my capability.
Side note: I send the Rigol SCPI commands via USB using 'Messinstrumente' (Measuring instruments - program for data transfer and control) which is very easy and always works for me. You enter the SCPI command in the command window and then press Send/Receive. The command goes out and a second later you see the results as received data. A good test to see that all is working OK is to send *IDN?, and you should see a reply (Receive Data) with your Model Number and S/N. Other commands may reply with something like 'Command Executed OK'. If the command is invalid the program will simply time out 'without a reply', or 'Invalid Command', etc. in 3 - 6 seconds.
I just wondered why I didn't read about anyone else using this for the DP832 to DP832A Mod? There is a USB type B connector on the back of the unit for this, in addition to the USB type A connector for the USB drive. It seemed to me that everyone was using LAN or RS232 when the USB is so easy.
Rigol Ultra Sigma would also work for sending USB SCPI commands, but at the expense of adding about 500 GB to your computer, and not being able to uninstall it ALL without
manually searching for left over Files and Registry entries. Even using the more complete Uninstallers such as 'Revo Uninstaller', they won't catch everything, as there will still be well over ten items that won't be automatically cleaned out.
PS: 'Messinstrumente' is a portable program that doesn't get installed on your computer. You can simply run it from a USB drive, the Desk Top, etc.
Edit: By request, here is a English link to
'Messinstrumente' (Measuring instruments - program for data transfer and control) ->
https://translate.google.com/translate?hl=en&sl=de&u=http://peter.dreisiebner.at/messinstrumente/index.htm