Changing rate of floating window size change i3

[origamisith]

So, I use i3, and set all borders to 0. When I make a window float and the default size it pops out is inapprpriate, in i3's resize mode it takes forever to use the arrow keys to change the window size. Since I don't have borders, I can't drag the window edges with my mouse. Is there a way to make resize mode grow / shrink the window more quickly with the arrow keys in i3?