I do believe I've made this suggestion before.
For Endpoint Manager template creation - create a new tab called "custom config fields". This tab will be an open Text Box where we can paste in provisioning parameters specific to the device / phone version we're creating template for.
Once template saved, these additional parameters (values) we enter will auto PREPEND to the config files that get generated for the phones to be provisioned. These values need to be inserted before the </EOF> So as long as prepended to very bottom of other generated values before the </> we should be good.
This would greatly fix issues with the EndPoint Manager missing provisioning values / options. Let us enter our own values that are phone specific.