Support for Tablespace Outside of the Data Directory

I'd like to see support for creating the "new" table in a user defined tablespace:
https://dev.mysql.com/doc/refman/5.7/en/tablespace-placing.html

Is it feasible to request this being implemented or make a pull request which would allow this as a command line option? I realize this may cause issues in replicated setups where the slaves and masters have differing file systems, but I'm assuming the onus can be put on the user to be sure this would work.

Thanks,
Tate