"GiveItem" does not stack items?

[ingedoom]

This is not something you can do through your .hps file. You need to snoop around in the .ent file of tinderboxes and eventually open it in model editor. But don't get your hopes up to soon. It shouldn't be easy.. If it's not stricktly neccesary that they stack, then don't let yourself be bothered with it for too long if you can't get it working.