Is there a way to change what the go / submit button on a mobile keyboard does?

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http://stackoverflow.com – We have a shopping cart form which has 3 submit buttons (one to update the quantity, one to enter a promo code, and one to finish the checkout). On desktop the user is expected to click the submit button next to the item they are affecting and this is generally what happens, the button is close to where their mouse/keyboard focus is and the visual association is strong. On mobile it feels more natural to click the "go" or "submit" button provided by the mobile keyboard. This submits the form using the first submit button on the page rather than the most appropriate one. Can I change what h (HowTos)