Currently, enabling the use of extended events is a global setting.

It would be great if this could be enabled per server, to avoid well-documented issues (https://support.microsoft.com/en-us/help/2878139/fix-using-dbghelp-dll-version-4-0-5-error-is-logged-in-sql-server-2012) between extended events and older versions of SQL Server (namely SQL 2008 which is still in extended support until 2019)