That's great, will expand (and rename) the UScheduler to include this as well.I believe this is the registry key that auto installs the Dev Home app.
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Appx\AppxAllUserStore\ProvisionApplications\Incoming\Microsoft.Windows.DevHome_8wekyb3d8bbwe]
"StoreId"="9N8MHTPHNGVV"
After removing it the app no longer installs. I was also able to modify it to install other apps.