Hey @Starstreak. The article that you are referencing is slightly different than the current Modes for the Alarm, so I want to make sure there is no confusion. This Modes feature, you may not have yet, as it is slowly being rolled out. This feature is to control your cameras though, so when you are home you can disarm your cameras to not record anything. In comparison, when you are in away for your cameras, it will record and notify you of motion and so on.
The feature you are looking for will be Linked Devices. If you go into your Alarm’s Base Station in Devices, you will see a tile for “Linked Devices.” Under Linked Devices, you can have it so when your alarm goes off, it will start recording on all of your cameras that you select. I have this feature for my Indoor Cam as well. For my Indoor Cam, I have record motion turned off so that it doesn’t record when I am home. Although, with this device linked to my alarm through Linked Devices, whenever my alarm goes into an entry delay or is triggered to siren, it will start recording and override me saying no to “record motion.” This is the way you can achieve your first objective.
For your second concern, if your alarm goes off and your cameras are linked through Linked Devices, it will trigger the cameras to turn on and start recording if not already recording for any reason. This may be what you are looking for, over modes. For Cams and Doorbells that you cannot turn off “Record Motion” like the Indoor Cam, you will need to wait for this Modes feature to be available to you, so that they are only recording when you are away. Hope this helps clear it up for you!