Enable DELAY_KEY_WRITE?

I just saw the option DELAY_KEY_WRITE in phpMyAdmin so I thought, let's see what that's about. After reading a bit it looks like a great feature, but then I saw this: MySQL :: MySQL 5.5 Reference Manual :: 5.1.7 Server System Variables [QUOTE]If DELAY_KEY_WRITE is enabled for a table, the key buffer is not flushed for the table on every index update, but only when the table is closed. This speeds up writes on keys a lot, but if you use this feature, you should add automatic checking of all MyISAM tables by starting the server with the --myisam-recover-options=BACKUP,FORCE).
How can I enable that in CPanel?