allow-run-as-system flag official support

[manoharc1999]

Hello
Im planning to use this flag (allow-run-as-system) for one of my application.
When i checked the documentation it says it is not recommended to use this flag in production application.
The flag is very much crucial for my application to work and im afraid it might get removed.
Can this flag be moved in to official support as it was introduced almost 2 yrs ago?
#1907

[victorhuangwq]

Reply as per given in #1907