Hmm - well I don't see a big issue with this. O:
Brown or custom, will it honestly matter? How often will one see the actual paw pads of their character? ^^;
I suppose for creativity's sake, why not then? Surely it can not take up too much time to implement this sort of additional feature into the games settings for one who has already done so much for this community, no?
Perhaps have the paw pads brown my default, that way if people don't want to change it they can keep the default brown. =3