Azure Application Gateway and NTLM

Question

Hi All,

Background:
We have a third party ERM application that uses NTLM authentication.
We have written a Web API that integrates with that application.
The Web API sits behind an Azure Web Application Gateway (v1 sku).
The Web Application Gateway uses the Web Application FireWall to do response body inspection.
Web Application Gateway (v1 sku) has a response body size limit of 128KB.
This prevents many requests to our API from reaching the Web API and so we have to turn off response body inspection.
We looked at Web Application Gateway v2 sku, which has a response body size limit of 2MB, but it does not support NTLM.

Questions:

1. Will the Web Application Gateway v2 sku ever support NTLM?
2. How long will Web Application Gateway v1 continue to be available? I couldn't find a timetable for its support/lifetime.

Cheers,
Geoff