I have been asked to disable the \"ticking\" of a checkbox. I am not being asked to disable the checkbox, but to simply disable the \"ticking\".
In other w
Sounds to me like you are using the wrong interface element, a more suitable one would be a button that is disabled by default, but enabled when that option is available. The image displayed can be whatever you want.
When users have selected that feature, enable the button. The image on the button can be modified by CSS depending on whether it's enabled or not, or by the enable/disable function.
e.g.
Select options
Option 1
Option 2