I would prefer this as well, it gets really annoying trying to dodge arrows when it wont let you dodge or roll or parry yet. You can still avoid them by moving left or right before they hit you, but I picked arrow deflection for a reason, and as it stands I can only do it if I'm close enough to at least 1 enemy that will put me into combat mode.
As for rebinding, I don't think that will work considering on PC you already can rebind parry and witcher senses to separate buttons in the keybinding options menu, and that still doesn't let you parry outside of combat mode.
As for rebinding, I don't think that will work considering on PC you already can rebind parry and witcher senses to separate buttons in the keybinding options menu, and that still doesn't let you parry outside of combat mode.