Flyright,
No worries or need to apologize. I just wanted to make sure you had all the info. Our forums tend to have a support role too, so you will also see lots of questions, answers and pilot collaboration to constantly improve our product. Feel free to contact me if I can help with your decision on a 740 or even the App. I'd like to help if possible.
This one with a "Home Airport" in the mountains maybe a little different. Without knowing the actual airport, is it a PVT airport on the chart or registered with the FAA? If so, then we would automatically reduce terrain alerts to only a "Five Hundred" callout, other terrain alerts should be eliminated within that Airport Zone.
Now, if it is a non-registered airport, we might not know it's there. So in that case we can't automatically eliminate the terrain alerts. However by taping Setup -> Alert & Warnings -> Terrain Alerts, then they can be turned of or reduced. You can even leave the screen terrain highlighting on, but turn off the audible and visual alert messages. Attached is a picture of these settings.