I’m sorry, I take that back – that bind thing is a house rule we have used in playtesting but it’s not published (yet).
There is a small table in the Core Rules (bottom of page 52 in the current version) which lists modifiers for using weapons one vs two handed, conferring +1 damage to using a one handed weapon in two hands, for example, and penalties to speed and defense for using Hand and a Half (HH) and Two Handed (TH) weapons one handed.