Adding Category buttons to Task Form

[Jon]

There are about 5 Categories that I use time and again on my Tasks. I would
much prefer to have a single click to select a Category, rather than click
the Categories button, Select the Task and then click Ok (3 clicks).

Is there any way I can put my commonly used Categories onto the Task Form as
tick boxes and tick them from there? Or do they have to be in the popup
Categories selector window?

Regards,

Jon