Can you disable PHP/CGI features on Feature Manager?

There are no native features that will disable the parsing of all files on accounts assigned a specific feature list, however could setup a reseller account and ensure accounts created under that reseller are assigned a specific IP address by following the instructions at:

Manage Reseller's Shared IP - Documentation - cPanel Documentation

Then, browse to "WHM >> Apache Configuration >> Reserved IP Address Editor" and select "Reserved" next to the IP address assigned to the reseller. This option configures Apache to ignore HTTP requests on the selected IP addresses.

Thank you.