Toggle certain carrier checkboxes standard to 'ON' in BO when adding new product

[ivo71]

Hi,

Can anybody help with what code to change?
I have about 8 different carrier (courier/postage) option and standard all 8 will be available for a new product unless I 'tick' (enable) the check boxes of the 1st two couriers that 99% of the products need. I would like to change code to do the following:

When I go into BO and add new product, I don't want to go to the shipping tab, but I have to go there to tick the check box of the first two carriers.
I would like these boxes to be ticked automatically when I add a new product.

Currently the program says if none is ticked, all 8 will be used. So I have to go to shipping tab to check the two boxes of the first two options for every product I create.
I like to keep it simple and only have to edit the base/main page of the new added product and save it and be done.
The other courier options are only used for a very small percentage of my products.

Currently I don't have a clue in which file to look. Any help or idea's are welcome.

Thanks for your help.

Ivo.