So I figured out how to accomplish this, and I will leave this as a record for anyone else who needs to solve this problem. (NOTE : this solution has only been tested on safari and Firefox)
for:
<input id="text" type="text" />
the function
document.getElementById('text').onkeydown = new function(event){return false}
Will not cause the window to shift the scroll so that a user can see the input field when he types into the field. If like me you want this to happen for some letters but not for others simply edit the contents of the onkeydown function so that it returns false for certain keycodes and true for others.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…