Default values for custom fields after opening form

RT Users
1

Hello everybody,

is there any possibility to set default values for some custom fields
right after opening form, not after pressing create button. I found just
the way of setting default values after pressing create button (you can
find it here DefaultCustomFieldValue - Request Tracker Wiki).

I am using Request Tracker 3.8.1.

Tahnks in advance for any help,
Tom.