Q. There has been some debate about the tinkerer talent (pg 143 core rulebook), can you add a HP to items that currently have 0 HPs or only to items that have 1 or more HPs?
A. Yes, generally you can add HP to items that currently have 0 HP. As always, of course, the GM can say no to something really silly (such as adding a HP to a stick being used as an Improvised Weapon, or maybe adding HPs to most grenades, for example).
It's really great that these guys take time from thier busy schedule to answer us directly.