drush.phar and custom php.ini


I`ve  just installed Drush 8 with the method recommended on the official website ( drush.phar ):

Last time I installed drush I used composer and for that method I could add the php.ini values into the drush.ini, now I do not understand how to pass custom php values: for example in my php.ini   exec() has been disabled for security reasons , I`d like to permanently enable exec() only for Drush:

In the instructions i can see:

If you need to pass custom php.ini values, run php -d foo=bar drush.phar --php-options=foo=bar

 so I tried to run

php -d disable_functions= /usr/local/bin/drush status --php-options=disable_functions

and the response is:

 PHP configuration      :  /opt/cpanel/ea-php71/root/etc/php.ini 
 PHP OS                 :  Linux                                 
 Drush script           :  /usr/local/bin/drush                  
 Drush version          :  8.1.17                                
 Drush temp directory   :  /tmp                                  
 Drush configuration    :                                        
 Drush alias files      :  

so the warnig abouth the disabled exec function disappeared, but it is only temporary, the next time I have to rewrite it all over again.

Drupal version: 

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