How to automatically set the value of a field?

[Soma]

Something that's in dev since 2.3.1 is that you can make the autoload specific. More infos can found here http://processwire.com/talk/topic/3768-processwire-231-dev-branch/ : 3. Conditional autoload modules.

This is because if you look at your module, it will get loaded and hook added in init on EVERY request, even on front-end. So to make this easy you can use a selector or an anonymous function (php 5.3 only). 

To only load this module in the admin, you could then do 

"autoload" => "template=admin",

[bytesource]

@Soma

That is great news, indeed! Thanks a lot!

Cheers, 

Stefan