Double knives

I've searched the forum and can't see another suggestion about it.
So, how about having two knives? Maybe left clicking to slash with left knife, holding down to stab with left knife.
Might stop people constantly complaing of axes/shovels.
Also, perhaps making them a GP item, but a high amount of GP as I doubt people would spend ZP on them if they could get axe/shovel.
Just a thought.