Add tags to tickets created by WebForm

Hi Luca,
 
Currently, it is not possible to add tags directly in the Guide / Help Center theme code. Triggers would be the easiest option by far to add a tag to all tickets that are created by the web form. 
 
Otherwise, the only other tag-based thing that we can think of is having a custom drop-down or checkbox ticket field that applies a tag when selected or checked. You'd just need to hide that field using custom code. Best resource we can give is our cookbook on help center Javascript recipes. I hope this helps!